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7638 Gladman, provisional designation 1984 UX, is a stony background asteroid from the central region of the asteroid belt, approximately 5.8 kilometers (3.6 miles) in diameter. It was discovered on 26 October 1984, by American astronomer Edward Bowell at Lowell's Anderson Mesa Station near Flagstaff, Arizona.[1] The S-type asteroid has a rotation period of 17.3 hours.[4] It was named after Canadian astronomer Brett J. Gladman.[2]

7638 Gladman
Discovery [1]
Discovered byE. Bowell
Discovery siteAnderson Mesa Stn.
Discovery date26 October 1984
MPC designation(7638) Gladman
Named after
Brett J. Gladman[2]
(Canadian astronomer)
1984 UX · 1969 AF
1988 UN
main-belt[1][3] · (middle)[4]
Orbital characteristics[3]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 0
Observation arc49.46 yr (18,066 d)
Aphelion3.3331 AU
Perihelion1.7459 AU
2.5395 AU
4.05 yr (1,478 d)
0° 14m 36.6s / day
Physical characteristics
Mean diameter
5.839±0.405 km[6][7]
17.3±0.1 h[8]
S/Sk (S3OS2)[9]
13.478±0.005 (R)[10]

Orbit and classificationEdit

Gladman is a non-family asteroid from the main belt's background population.[5] It orbits the Sun in the central asteroid belt at a distance of 1.7–3.3 AU once every 4 years and 1 month (1,478 days; semi-major axis of 2.54 AU). Its orbit has an eccentricity of 0.31 and an inclination of 7° with respect to the ecliptic.[3] 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, where the Alinda asteroid are located. However, Gladman's eccentricity is lower than that of most Alinda asteroids.

It was first observed as 1969 AF at Crimea–Nauchnij in January 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.[1]


This minor planet was named for Canadian astronomer Brett J. Gladman (born 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).[11]

Physical characteristicsEdit

Gladman has been characterized as a stony S-type asteroid in the Tholen-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2). In their SMASS-like taxonomy, S3OS2 classified Gladman as an Sk-subtype that transitions to the K-type asteroids.[9]

Rotation periodEdit

Three rotational lightcurves of Gladman have been obtained from photometric observations.[8][10][12] 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+). Subsequent photometric observations by 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 (best) and 16.1956 hours with a brightness amplitude of 0.50 and 0.25, respectively (U=2/2).[4]

Diameter and albedoEdit

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures 5.839 kilometers in diameter and its surface has an albedo of 0.248,[7][6] 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.[4]


  1. ^ a b c d e "7638 Gladman (1984 UX)". Minor Planet Center. Retrieved 15 January 2019.
  2. ^ a b c Schmadel, Lutz D. (2007). "(7638) Gladman". Dictionary of Minor Planet Names – (7638) Gladman. Springer Berlin Heidelberg. p. 607. doi:10.1007/978-3-540-29925-7_6592k (inactive 20 August 2019). ISBN 978-3-540-00238-3.
  3. ^ a b c d "JPL Small-Body Database Browser: 7638 Gladman (1984 UX)" (2018-07-03 last obs.). Jet Propulsion Laboratory. Retrieved 15 January 2019.
  4. ^ a b c d "LCDB Data for (7638) Gladman". Asteroid Lightcurve Database (LCDB). Retrieved 3 May 2018.
  5. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 3 May 2018.
  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.
  7. ^ 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". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. (catalog)
  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.
  9. ^ a b Lazzaro, D.; Angeli, C. A.; Carvano, J. M.; Mothé-Diniz, T.; Duffard, R.; Florczak, M. (November 2004). "S3OS2: the visible spectroscopic survey of 820 asteroids" (PDF). Icarus. 172 (1): 179–220. Bibcode:2004Icar..172..179L. doi:10.1016/j.icarus.2004.06.006. Retrieved 4 May 2018.
  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.
  11. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 5 November 2016.
  12. ^ Behrend, Raoul. "Asteroids and comets rotation curves – (7638) Gladman". Geneva Observatory. Retrieved 5 November 2016.

External linksEdit