7638 Gladman
| Discovery [1] | |
|---|---|
| Discovered by | E. Bowell |
| Discovery site | Anderson Mesa Stn. |
| Discovery date | 26 October 1984 |
| Designations | |
| (7638) Gladman | |
Named after | Brett J. Gladman (astronomer)[2] |
| 1984 UX · 1969 AF 1988 UN | |
| main-belt · (middle) | |
| Orbital characteristics [1] | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 47.82 yr (17,467 days) |
| Aphelion | 3.3342 AU |
| Perihelion | 1.7424 AU |
| 2.5383 AU | |
| Eccentricity | 0.3136 |
| 4.04 yr (1,477 days) | |
| 3.8765° | |
| 0° 14m 37.32s / day | |
| Inclination | 6.8217° |
| 9.9905° | |
| 22.479° | |
| Earth MOID | 0.7506 AU |
| Physical characteristics | |
| Dimensions | 5.839±0.405 km[3][4] 5.93 km (calculated)[5] |
| 15 h[6] 16.1956±0.0082 h[7] 17.3±0.1 h[8] | |
| 0.20 (assumed)[5] 0.248±0.071[3][4] | |
| S [5] | |
| 13.3[3] · 13.478±0.005 (R)[7] · 13.5[1][5] | |
7638 Gladman, provisional designation 1984 UX, is a stony asteroid from the middle region of the asteroid belt, approximately 6 kilometers in diameter. It was discovered on 26 October 1984, by American astronomer Edward Bowell at Lowell's Anderson Mesa Station near Flagstaff, Arizona, and named after Canadian astronomer Brett J. Gladman.[2][9]
Orbit and classification
The S-type asteroid orbits the Sun at a distance of 1.7–3.3 AU once every 4.04 years (1,477 days). Its orbit has an eccentricity of 0.31 and an inclination of 7° with respect to the ecliptic.[1] With a semi-major axis of 2.53 AU, Gladman is not far from a prominent Kirkwood gap at 2.5 AU, which corresponds to a 3:1 orbital resonance with the gas giant Jupiter. It might be a possible member of the Alinda family, however, its eccentricity is lower than that of most members of that family.
Gladman was first identified as 1969 AF at Crimea–Nauchnij in 1969. The asteroid's observation arc begins with its first used observation at Palomar in November 1984, one month after its official discovery at Anderson Mesa.[9]
Physical characteristics
Three rotational lightcurves of Gladman have been obtained from photometric observations. In October 2014, observations by French amateur astronomer Laurent Bernasconi gave a fragmentary lightcurve with a rotation period of 15 hours and brightness variation of 0.21 magnitude (U=1+).[6] Subsequent photometric observations by astronomer James Brinsfield at the Via Capote Observatory (G69) in October 2010, and by astronomers at the Palomar Transient Factory in March 2014, gave an improved period of 17.3 and 16.1956 hours with a brightness amplitude of 0.50 and 0.25, respectively (U=2/2).[7][8]
According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures 5.8 kilometers in diameter and its surface has an albedo of 0.248,[3][4] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 5.9 kilometers, based on an absolute magnitude of 13.5.[5]
Naming
This minor planet was named for Canadian astronomer Brett J. Gladman (b. 1966), discoverer of minor planets and co-discoverer of 6 irregular moons of Uranus: Caliban, Sycorax, Prospero, Setebos, Stephano and Ferdinand. He participated in surveys of trans-Neptunian objects. He is also known for his research and modeling on the dynamical evolution and transport of near-Earth objects and meteorites, respectively.[2] Naming citation was published on 28 July 1999 (M.P.C. 35486).[10]
References
- ^ a b c d "JPL Small-Body Database Browser: 7638 Gladman (1984 UX)" (2016-11-11 last obs.). Jet Propulsion Laboratory. Retrieved 4 December 2016.
- ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (7638) Gladman. Springer Berlin Heidelberg. p. 607. ISBN 978-3-540-00238-3. Retrieved 5 November 2016.
- ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 5 November 2016.
- ^ 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 5 November 2016.
{{cite journal}}: CS1 maint: multiple names: authors list (link) - ^ a b c d e "LCDB Data for (7638) Gladman". Asteroid Lightcurve Database (LCDB). Retrieved 5 November 2016.
- ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (7638) Gladman". Geneva Observatory. Retrieved 5 November 2016.
- ^ a b c 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 5 November 2016.
- ^ a b Brinsfield, James W. (April 2009). "Asteroid Lightcurve Analysis at the Via Capote Observatory: 2008 4th Quarter". The Minor Planet Bulletin. 36 (2): 64–66. Bibcode:2009MPBu...36...64B. ISSN 1052-8091. Retrieved 5 November 2016.
- ^ a b "7638 Gladman (1984 UX)". Minor Planet Center. Retrieved 5 November 2016.
- ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 5 November 2016.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
- 7638 Gladman at the JPL Small-Body Database
