7638 Gladman

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7638 Gladman
Discovery [1]
Discovered by E. Bowell
Discovery site Anderson Mesa Stn.
Discovery date 26 October 1984
MPC designation (7638) Gladman
Named after
Brett J. Gladman
1984 UX · 1969 AF
1988 UN
main-belt · (middle)
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 48.03 yr (17,544 days)
Aphelion 3.3335 AU
Perihelion 1.7423 AU
2.5379 AU
Eccentricity 0.3135
4.04 yr (1,477 days)
0° 14m 37.68s / day
Inclination 6.8216°
Earth MOID 0.7500 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]
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[edit]

The S-type asteroid orbits the Sun in the central main-belt 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[edit]

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 with an absolute magnitude of 13.5.[5]


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] The approved naming citation was published by the Minor Planet Center on 28 July 1999 (M.P.C. 35486).[10]


  1. ^ a b c d "JPL Small-Body Database Browser: 7638 Gladman (1984 UX)" (2017-01-27 last obs.). Jet Propulsion Laboratory. Retrieved 4 July 2017. 
  2. ^ 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. 
  3. ^ 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. Bibcode:2011ApJ...741...90M. arXiv:1109.6407Freely accessible. doi:10.1088/0004-637X/741/2/90. Retrieved 5 November 2016. 
  4. ^ 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. Bibcode:2011ApJ...741...68M. arXiv:1109.4096Freely accessible. doi:10.1088/0004-637X/741/2/68. Retrieved 5 November 2016. 
  5. ^ a b c d e "LCDB Data for (7638) Gladman". Asteroid Lightcurve Database (LCDB). Retrieved 5 November 2016. 
  6. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (7638) Gladman". Geneva Observatory. Retrieved 5 November 2016. 
  7. ^ 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. Bibcode:2015AJ....150...75W. arXiv:1504.04041Freely accessible. doi:10.1088/0004-6256/150/3/75. Retrieved 5 November 2016. 
  8. ^ 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. 
  9. ^ a b "7638 Gladman (1984 UX)". Minor Planet Center. Retrieved 5 November 2016. 
  10. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 5 November 2016. 

External links[edit]