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{{Short description|Stony Florian asteroid from the inner regions of the asteroid belt}}
'''2195 Tengström''' is a [[main belt]] [[asteroid]] with an [[orbital period]] of 1209.6638432 days (3.31 years).<ref name="JP: Small-body Database Browser">{{cite web | url = http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2195 | title = JPL Small-Body Database Browser | accessdate = 2008-05-17 | publisher = [[NASA]]}}</ref>
{{Use dmy dates|date=October 2019}}
{{Infobox planet
The asteroid was discovered on September 27, 1941.
| minorplanet = yes
| name = 2195 Tengström
| background = #D6D6D6
| image =
| image_size =
| caption =
| discovery_ref = &thinsp;<ref name="jpldata" />
| discovered = 27 September 1941
| discoverer = [[Liisi Oterma|L. Oterma]]
| discovery_site = [[Iso-Heikkilä Observatory|Turku Obs.]]
| mpc_name = (2195) Tengström
| alt_names = {{mp|1941 SP|1}}{{·}}{{mp|1931 TC|3}}<br />1934 PQ{{·}}1936 DF<br />1943 GT{{·}}1944 QD<br />1951 VA{{·}}{{mp|1973 GC|1}}<br />{{mp|1974 RC|2}}{{·}}{{mp|1976 GO|4}}
| pronounced =
| named_after = [[Erik Tengström]]<br />{{small|(Swedish [[Geodesy|geodesist]])}}<ref name="springer" />
| mp_category = [[main-belt]]{{·}}[[Flora family|Flora]]&thinsp;<ref name="lcdb" />
| orbit_ref = &thinsp;<ref name="jpldata" />
| epoch = 4 September 2017 ([[Julian day|JD]] 2458000.5)
| uncertainty = 0
| observation_arc = 85.57 yr (31,253 days)
| aphelion = 2.4574 [[Astronomical unit|AU]]
| perihelion = 1.9861 AU
| semimajor = 2.2217 AU
| eccentricity = 0.1061
| period = 3.31 [[Julian year (astronomy)|yr]] (1,210 days)
| mean_anomaly = 317.69[[Degree (angle)|°]]
| mean_motion = {{Deg2DMS|0.2976|sup=ms}} / day
| inclination = 4.5747°
| asc_node = 100.96°
| arg_peri = 295.55°
| dimensions = {{val|7.14|1.13}} km<ref name="Nugent-2015" /><br />{{val|7.17|0.41}} km<ref name="Masiero-2012" /><br />{{val|8.627|0.060}} km<ref name="Masiero-2011" /><br />{{val|8.732|0.044}} km<ref name="WISE" /><br />8.98 km {{small|(calculated)}}<ref name="lcdb" />
| rotation = {{val|2.816|0.003}} [[Hour|h]]<ref name="Higgins-2006f" /><br />{{val|2.82|0.05}} h<ref name="geneva-obs" /><br />{{val|2.82092|0.00004}} h{{efn|name=LCDB-Pravec-2011}}<br />{{val|2.8210|0.0001}} h{{efn|name=LCDB-Pravec-2016}}<br />{{val|2.8211|0.0001}} h<ref name="geneva-obs" /><br />{{val|2.82112|0.00007}} h{{efn|name=LCDB-Higgins-2011}}<br />{{val|2.82117|0.00005}} h<ref name="geneva-obs" /><br />{{val|2.829|0.0007}} h<ref name="Waszczak-2015" />
| albedo = 0.24 {{small|(assumed)}}<ref name="lcdb" /><br />{{val|0.3361|0.0301}}<ref name="WISE" /><br />{{val|0.343|0.051}}<ref name="Masiero-2011" /><br />{{val|0.39|0.15}}<ref name="Nugent-2015" /><br />{{val|0.453|0.106}}<ref name="Masiero-2012" />
| spectral_type = [[M-type asteroid|M]]&thinsp;<ref name="WISE" />{{·}}[[S-type asteroid|S]]&thinsp;<ref name="lcdb" />
| abs_magnitude = 12.1<ref name="WISE" />{{·}}12.20<ref name="Masiero-2012" />{{·}}{{val|12.237|0.001}} {{small|(R)}}<ref name="Waszczak-2015" />{{·}}{{val|12.27|0.23}}<ref name="Veres-2015" />{{·}}12.30<ref name="Nugent-2015" />{{·}}12.4<ref name="jpldata" /><ref name="lcdb" />
}}


'''2195 Tengström''', provisional designation {{mp|1941 SP|1}}, is a stony Florian [[asteroid]] from the inner regions of the [[asteroid belt]], approximately 8 kilometers in diameter. It was discovered on 27 September 1941, by Finnish astronomer [[Liisi Oterma]] at [[Turku Observatory]] in Southwest Finland,<ref name="MPC-Tengström" /> and named for Swedish geodesist [[Erik Tengström]].<ref name="springer" />
==References==


== Orbit and classification ==
{{Reflist}}


''Tengström'' is a member of the [[Flora family]] of stony asteroids, one of the largest families of the main belt. It orbits the Sun in the [[Kirkwood gap|inner]] main-belt at a distance of 2.0–2.5&nbsp;[[Astronomical unit|AU]] once every 3 years and 4 months (1,210 days). Its orbit has an [[orbital eccentricity|eccentricity]] of 0.11 and an [[orbital inclination|inclination]] of 5[[Degree (angle)|°]] with respect to the [[ecliptic]].<ref name="jpldata" /> It was first identified as {{mp|1931 TC|3}} at [[Lowell Observatory]] in 1931, extending the asteroid's [[observation arc]] by 10 years prior to its official discovery observation at Turku.<ref name="MPC-Tengström" />
{{Minor planets navigator|2194 Arpola|2196 Ellicott}}
{{Small Solar System bodies}}


== Physical characteristics ==
<references/>


''Tengström'' has been characterized as a metallic [[M-type asteroid|M-type]] and stony [[S-type asteroid]].<ref name="lcdb" /><ref name="WISE" />
{{DEFAULTSORT:Tengstrom}}
[[Category:Main Belt asteroids]]
[[Category:Asteroids named for people]]
[[Category:Astronomical objects discovered in 1941]]


=== Rotation period ===


Between 2006 and 2016, several well defined rotational [[lightcurve]]s of ''Tengström'' were obtained by astronomers [[David Higgins (astronomer)|David Higgins]], [[Petr Pravec]], [[Pierre Antonini]] and [[René Roy (astronomer)|René Roy]] ({{small|[[LCDB quality code|U=3/3/3/3/3]]}}).<ref name="geneva-obs" />{{efn|name=LCDB-Pravec-2011}}{{efn|name=LCDB-Pravec-2016}}{{efn|name=LCDB-Higgins-2011}} Lightcurve analysis gave a [[rotation period]] of 2.821 hours with a brightness variation between 0.17 and 0.45 [[Magnitude (astronomy)|magnitude]].{{efn|name=Lightcurveplot}} For an asteroid of its size, ''Tengström'' has a relatively fast spin rate, not far from the 2.2-hour threshold for [[List of fast rotators (minor planets)|fast rotators]].
{{Beltasteroid-stub}}


=== Diameter and albedo ===
[[de:(2195) Tengström]]

[[eo:2195 Tengström]]
According to the survey carried out by NASA's [[Wide-field Infrared Survey Explorer]] with its subsequent [[NEOWISE]] mission, ''Tengström'' measures between 7.14 and 8.73 kilometers in diameter and its surface has a high [[astronomical albedo|albedo]] of 0.34 to 0.45. NEOWISE also classifies it as a metallic asteroid, despite its much higher albedo.<ref name="Nugent-2015" /><ref name="Masiero-2012" /><ref name="Masiero-2011" /><ref name="WISE" /> The ''Collaborative Asteroid Lightcurve Link'' assumes an albedo of 0.24 – derived from [[8 Flora]], the family's largest member and namesake – and calculates a diameter of 8.98 kilometers using an [[absolute magnitude]] of 12.4.<ref name="lcdb" />
[[fa:سیارک ۲۱۹۵]]

[[it:2195 Tengström]]
== Naming ==
[[la:2195 Tengström]]

[[hu:2195 Tengström]]
This [[minor planet]] was named after Swedish [[geodesist]] and astronomer [[Erik Tengström]] (1913–1996), emeritus professor at [[Uppsala University]] on the celebration of his 70th anniversary.<ref name="springer" /> The official naming citation was published by the [[Minor Planet Center]] on 28 March 1983 ({{small|[[Minor Planet Circulars|M.P.C.]] 7782}}).<ref name="MPC-Circulars-Archive" />
[[pl:2195 Tengström]]

[[pt:2195 Tengstrom]]
== Notes ==
[[sk:2195 Tengstrom]]
{{notelist|30em|refs=
[[sr:2195 Tengstrom]]

[[tl:2195 Tengström]]
{{efn|name=LCDB-Pravec-2011|1=Pravec (2011) web: rotation period {{val|2.82092|0.00004}} hours; amplitude of {{val|0.31}} mag.; quality code of 3. Summary figures for (2195) Tengström at [http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=2195%7CTengström Collaborative Asteroid Lightcurve Link (CALL)] and [http://www.asu.cas.cz/~ppravec/neo.htm Pravec, P.; Wolf, M.; Sarounova, L. (2011)]}}
[[uk:2195 Тенгстрьом]]

[[vi:2195 Tengström]]
{{efn|name=LCDB-Pravec-2016|1=Pravec (2016) web: rotation period {{val|2.8210|0.0001}} hours; amplitude of {{val|0.21}} mag.; quality code of 3. Summary figures for (2195) Tengström at [http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=2195%7CTengström Collaborative Asteroid Lightcurve Link (CALL)] and [http://www.asu.cas.cz/~ppravec/neo.htm Pravec, P.; Wolf, M.; Sarounova, L. (2016)]}}
[[yo:2195 Tengström]]

{{efn|name=LCDB-Higgins-2011|1=Higgins (2011) web: rotation period {{val|2.82112|0.00007}} hours; amplitude of {{val|0.17}} mag.; quality code of 3. Summary figures for (2195) Tengström at [http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=2195%7CTengström Collaborative Asteroid Lightcurve Link (CALL)]}}

{{efn|name=Lightcurveplot|1=Lightcurve plot from [http://www.asu.cas.cz/~asteroid/02195_b1.png December 2011, 2.82092 hours] and [http://www.asu.cas.cz/~asteroid/02195_b6.png April 2016, 2.8210 hours] by Pray, Kusnirak, Pravec [http://www.asu.cas.cz/~ppravec/newres.txt Ondřejov Observatory – unpublished data]}}

}} <!-- end of notelist -->

== References ==
{{reflist|30em|refs=

<ref name="jpldata">{{cite web
|type = 2017-05-04 last obs.
|title = JPL Small-Body Database Browser: 2195 Tengstrom (1941 SP1)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2002195
|publisher = [[Jet Propulsion Laboratory]]
|access-date = 11 June 2017}}</ref>

<ref name="springer">{{cite book
|title = Dictionary of Minor Planet Names – (2195) Tengström
|last = Schmadel | first = Lutz D.
|publisher = [[Springer Berlin Heidelberg]]
|page = 178
|date = 2007
|isbn = 978-3-540-00238-3
|doi = 10.1007/978-3-540-29925-7_2196 |chapter = (2195) Tengström }}</ref>

<ref name="MPC-Tengström">{{cite web
|title = 2195 Tengstrom (1941 SP1)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=2195
|access-date = 17 February 2017}}</ref>

<ref name="MPC-Circulars-Archive">{{cite web
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|access-date = 17 February 2017}}</ref>

<ref name="geneva-obs">{{cite web
|title = Asteroids and comets rotation curves – (2195) Tengström
|last = Behrend |first = Raoul
|publisher = [[Geneva Observatory]]
|url = http://obswww.unige.ch/~behrend/page4cou.html#002195
|access-date = 17 February 2017}}</ref>

<ref name="Masiero-2011">{{cite journal
|display-authors = 6
|first1 = Joseph R. |last1 = Masiero
|first2 = A. K. |last2 = Mainzer
|first3 = T. |last3 = Grav
|first4 = J. M. |last4 = Bauer
|first5 = R. M. |last5 = Cutri
|first6 = J. |last6 = Dailey
|first7 = P. R. M. |last7 = Eisenhardt
|first8 = R. S. |last8 = McMillan
|first9 = T. B. |last9 = Spahr
|first10 = M. F. |last10 = Skrutskie
|first11 = D. |last11 = Tholen
|first12 = R. G. |last12 = Walker
|first13 = E. L. |last13 = Wright
|first14 = E. |last14 = DeBaun
|first15 = D. |last15 = Elsbury
|first16 = T. IV |last16 = Gautier
|first17 = S. |last17 = Gomillion
|first18 = A. |last18 = Wilkins
|date = November 2011
|title = Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M
|journal = The Astrophysical Journal
|volume = 741
|issue = 2
|page = 20
|bibcode = 2011ApJ...741...68M
|doi = 10.1088/0004-637X/741/2/68
|arxiv = 1109.4096
|access-date= 17 February 2017}}</ref>

<ref name="lcdb">{{cite web
|title = LCDB Data for (2195) Tengström
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=2195%7CTengström
|access-date = 17 February 2017}}</ref>

<ref name="WISE">{{cite journal
|display-authors = 6
|first1 = A. |last1 = Mainzer
|first2 = T. |last2 = Grav
|first3 = J. |last3 = Masiero
|first4 = E. |last4 = Hand
|first5 = J. |last5 = Bauer
|first6 = D. |last6 = Tholen
|first7 = R. S. |last7 = McMillan
|first8 = T. |last8 = Spahr
|first9 = R. M. |last9 = Cutri
|first10 = E. |last10 = Wright
|first11 = J. |last11 = Watkins
|first12 = W. |last12 = Mo
|first13 = C. |last13 = Maleszewski
|date = November 2011
|title = NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results
|journal = The Astrophysical Journal
|volume = 741
|issue = 2
|page = 25
|bibcode = 2011ApJ...741...90M
|doi = 10.1088/0004-637X/741/2/90
|arxiv = 1109.6407}}</ref>

<ref name="Masiero-2012">{{cite journal
|display-authors = 6
|first1 = Joseph R. |last1 = Masiero
|first2 = A. K. |last2 = Mainzer
|first3 = T. |last3 = Grav
|first4 = J. M. |last4 = Bauer
|first5 = R. M. |last5 = Cutri
|first6 = C. |last6 = Nugent
|first7 = M. S. |last7 = Cabrera
|date = November 2012
|title = Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M
|journal = The Astrophysical Journal Letters
|volume = 759
|issue = 1
|page = 5
|bibcode = 2012ApJ...759L...8M
|doi = 10.1088/2041-8205/759/1/L8
|arxiv = 1209.5794
|access-date= 17 February 2017}}</ref>

<ref name="Nugent-2015">{{cite journal
|display-authors = 6
|first1 = C. R. |last1 = Nugent
|first2 = A. |last2 = Mainzer
|first3 = J. |last3 = Masiero
|first4 = J. |last4 = Bauer
|first5 = R. M. |last5 = Cutri
|first6 = T. |last6 = Grav
|first7 = E. |last7 = Kramer
|first8 = S. |last8 = Sonnett
|first9 = R. |last9 = Stevenson
|first10 = E. L. |last10 = Wright
|date = December 2015
|title = NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015ApJ...814..117N
|journal = The Astrophysical Journal
|volume = 814
|issue = 2
|page = 13
|bibcode = 2015ApJ...814..117N
|doi = 10.1088/0004-637X/814/2/117
|arxiv = 1509.02522
|access-date= 17 February 2017}}</ref>

<ref name="Higgins-2006f">{{Cite journal
|display-authors = 6
|first1 = David |last1 = Higgins
|first2 = Petr |last2 = Pravec
|first3 = Peter |last3 = Kusnirak
|first4 = Adrian |last4 = Galad
|first5 = Leos |last5 = Kornos
|first6 = Donald |last6 = Pray
|first7 = Robert A. |last7 = Koff
|date = December 2006
|title = Asteriod [sic] lightcurve analysis at Hunters Hill Observatory and collaborating stations - autumn 2006
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2006MPBu...33...89H
|journal = The Minor Planet Bulletin
|volume = 33
|issue = 4
|pages = 89–91
|issn = 1052-8091
|bibcode = 2006MPBu...33...89H
|access-date= 17 February 2017}}</ref>

<ref name="Waszczak-2015">{{cite journal
|display-authors = 6
|first1 = Adam |last1 = Waszczak
|first2 = Chan-Kao |last2 = Chang
|first3 = Eran O. |last3 = Ofek
|first4 = Russ |last4 = Laher
|first5 = Frank |last5 = Masci
|first6 = David |last6 = Levitan
|first7 = Jason |last7 = Surace
|first8 = Yu-Chi |last8 = Cheng
|first9 = Wing-Huen |last9 = Ip
|first10 = Daisuke |last10 = Kinoshita
|first11 = George |last11 = Helou
|first12 = Thomas A. |last12 = Prince
|first13 = Shrinivas |last13 = Kulkarni
|date = September 2015
|title = Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015AJ....150...75W
|journal = The Astronomical Journal
|volume = 150
|issue = 3
|page = 35
|bibcode = 2015AJ....150...75W
|doi = 10.1088/0004-6256/150/3/75
|arxiv = 1504.04041
|access-date= 17 February 2017}}</ref>

<ref name="Veres-2015">{{cite journal
|display-authors = 6
|first1 = Peter |last1 = Veres
|first2 = Robert |last2 = Jedicke
|first3 = Alan |last3 = Fitzsimmons
|first4 = Larry |last4 = Denneau
|first5 = Mikael |last5 = Granvik
|first6 = Bryce |last6 = Bolin
|first7 = Serge |last7 = Chastel
|first8 = Richard J. |last8 = Wainscoat
|first9 = William S. |last9 = Burgett
|first10 = Kenneth C. |last10 = Chambers
|first11 = Heather |last11 = Flewelling
|first12 = Nick |last12 = Kaiser
|first13 = Eugen A. |last13 = Magnier
|first14 = Jeff S. |last14 = Morgan
|first15 = Paul A. |last15 = Price
|first16 = John L. |last16 = Tonry
|first17 = Christopher |last17 = Waters
|date = November 2015
|title = Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V
|journal = Icarus
|volume = 261
|pages = 34–47
|bibcode = 2015Icar..261...34V
|doi = 10.1016/j.icarus.2015.08.007
|arxiv = 1506.00762
|access-date= 17 February 2017}}</ref>

}} <!-- end of reflist -->

== External links ==
* [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }})
* [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
* [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend
* [https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
* {{AstDys|2195}}
* {{JPL small body}}

{{Minor planets navigator |2194 Arpola |number= 2195| 2196 Ellicott}}
{{Small Solar System bodies}}
{{Authority control}}

{{DEFAULTSORT:Tengstrom}}
[[Category:Flora asteroids|002195]]
[[Category:Discoveries by Liisi Oterma]]
[[Category:Named minor planets]]
[[Category:Astronomical objects discovered in 1941|19410927]]

Latest revision as of 12:53, 7 July 2024

2195 Tengström
Discovery [1]
Discovered byL. Oterma
Discovery siteTurku Obs.
Discovery date27 September 1941
Designations
(2195) Tengström
Named after
Erik Tengström
(Swedish geodesist)[2]
1941 SP1 · 1931 TC3
1934 PQ · 1936 DF
1943 GT · 1944 QD
1951 VA · 1973 GC1
1974 RC2 · 1976 GO4
main-belt · Flora [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc85.57 yr (31,253 days)
Aphelion2.4574 AU
Perihelion1.9861 AU
2.2217 AU
Eccentricity0.1061
3.31 yr (1,210 days)
317.69°
0° 17m 51.36s / day
Inclination4.5747°
100.96°
295.55°
Physical characteristics
Dimensions7.14±1.13 km[4]
7.17±0.41 km[5]
8.627±0.060 km[6]
8.732±0.044 km[7]
8.98 km (calculated)[3]
2.816±0.003 h[8]
2.82±0.05 h[9]
2.82092±0.00004 h[a]
2.8210±0.0001 h[b]
2.8211±0.0001 h[9]
2.82112±0.00007 h[c]
2.82117±0.00005 h[9]
2.829±0.0007 h[10]
0.24 (assumed)[3]
0.3361±0.0301[7]
0.343±0.051[6]
0.39±0.15[4]
0.453±0.106[5]
M [7] · S [3]
12.1[7] · 12.20[5] · 12.237±0.001 (R)[10] · 12.27±0.23[11] · 12.30[4] · 12.4[1][3]

2195 Tengström, provisional designation 1941 SP1, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered on 27 September 1941, by Finnish astronomer Liisi Oterma at Turku Observatory in Southwest Finland,[12] and named for Swedish geodesist Erik Tengström.[2]

Orbit and classification

[edit]

Tengström is a member of the Flora family of stony asteroids, one of the largest families of the main belt. It orbits the Sun in the inner main-belt at a distance of 2.0–2.5 AU once every 3 years and 4 months (1,210 days). Its orbit has an eccentricity of 0.11 and an inclination of 5° with respect to the ecliptic.[1] It was first identified as 1931 TC3 at Lowell Observatory in 1931, extending the asteroid's observation arc by 10 years prior to its official discovery observation at Turku.[12]

Physical characteristics

[edit]

Tengström has been characterized as a metallic M-type and stony S-type asteroid.[3][7]

Rotation period

[edit]

Between 2006 and 2016, several well defined rotational lightcurves of Tengström were obtained by astronomers David Higgins, Petr Pravec, Pierre Antonini and René Roy (U=3/3/3/3/3).[9][a][b][c] Lightcurve analysis gave a rotation period of 2.821 hours with a brightness variation between 0.17 and 0.45 magnitude.[d] For an asteroid of its size, Tengström has a relatively fast spin rate, not far from the 2.2-hour threshold for fast rotators.

Diameter and albedo

[edit]

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Tengström measures between 7.14 and 8.73 kilometers in diameter and its surface has a high albedo of 0.34 to 0.45. NEOWISE also classifies it as a metallic asteroid, despite its much higher albedo.[4][5][6][7] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the family's largest member and namesake – and calculates a diameter of 8.98 kilometers using an absolute magnitude of 12.4.[3]

Naming

[edit]

This minor planet was named after Swedish geodesist and astronomer Erik Tengström (1913–1996), emeritus professor at Uppsala University on the celebration of his 70th anniversary.[2] The official naming citation was published by the Minor Planet Center on 28 March 1983 (M.P.C. 7782).[13]

Notes

[edit]
  1. ^ a b Pravec (2011) web: rotation period 2.82092±0.00004 hours; amplitude of 0.31 mag.; quality code of 3. Summary figures for (2195) Tengström at Collaborative Asteroid Lightcurve Link (CALL) and Pravec, P.; Wolf, M.; Sarounova, L. (2011)
  2. ^ a b Pravec (2016) web: rotation period 2.8210±0.0001 hours; amplitude of 0.21 mag.; quality code of 3. Summary figures for (2195) Tengström at Collaborative Asteroid Lightcurve Link (CALL) and Pravec, P.; Wolf, M.; Sarounova, L. (2016)
  3. ^ a b Higgins (2011) web: rotation period 2.82112±0.00007 hours; amplitude of 0.17 mag.; quality code of 3. Summary figures for (2195) Tengström at Collaborative Asteroid Lightcurve Link (CALL)
  4. ^ Lightcurve plot from December 2011, 2.82092 hours and April 2016, 2.8210 hours by Pray, Kusnirak, Pravec Ondřejov Observatory – unpublished data

References

[edit]
  1. ^ a b c d "JPL Small-Body Database Browser: 2195 Tengstrom (1941 SP1)" (2017-05-04 last obs.). Jet Propulsion Laboratory. Retrieved 11 June 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(2195) Tengström". Dictionary of Minor Planet Names – (2195) Tengström. Springer Berlin Heidelberg. p. 178. doi:10.1007/978-3-540-29925-7_2196. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f g "LCDB Data for (2195) Tengström". Asteroid Lightcurve Database (LCDB). Retrieved 17 February 2017.
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  5. ^ a b c d Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 17 February 2017.
  6. ^ a b c Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 17 February 2017.
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  9. ^ a b c d Behrend, Raoul. "Asteroids and comets rotation curves – (2195) Tengström". Geneva Observatory. Retrieved 17 February 2017.
  10. ^ a b Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 17 February 2017.
  11. ^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 17 February 2017.
  12. ^ a b "2195 Tengstrom (1941 SP1)". Minor Planet Center. Retrieved 17 February 2017.
  13. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 17 February 2017.
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