| Discovery[1] | |
|---|---|
| Discovered by | E. Bowell |
| Discovery site | Anderson Mesa Stn. |
| Discovery date | 26 October 1984 |
| Designations | |
| (7638) Gladman | |
Named after | Brett J. Gladman[2] (Canadian astronomer) |
| 1984 UX · 1969 AF 1988 UN | |
| main-belt[1][3] · (middle)[4] background[5] | |
| Orbital characteristics[3] | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 49.46yr (18,066 d) |
| Aphelion | 3.3331AU |
| Perihelion | 1.7459 AU |
| 2.5395 AU | |
| Eccentricity | 0.3125 |
| 4.05 yr (1,478 d) | |
| 198.89° | |
| 0° 14m 36.6s / day | |
| Inclination | 6.8157° |
| 9.9754° | |
| 22.493° | |
| Physical characteristics | |
| 5.839±0.405 km[6][7] | |
| 17.3±0.1 h[8] | |
| 0.248±0.071[6] 0.2480±0.0715[7] | |
| S/Sk(S3OS2)[9] | |
| 13.3[7] 13.478±0.005(R)[10] 13.5[1][3] | |
7638 Gladman, provisional designation1984 UX, is a stony backgroundasteroid from the central region of theasteroid belt, approximately 5.8 kilometers (3.6 miles) in diameter. It was discovered on 26 October 1984, by American astronomerEdward Bowell at Lowell'sAnderson Mesa Station near Flagstaff, Arizona.[1] TheS-type asteroid has arotation period of 17.3 hours.[4] It was named after Canadian astronomerBrett J. Gladman.[2]
Gladman is a non-family asteroid from the main belt'sbackground population.[5] It orbits the Sun in thecentral 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 aneccentricity of 0.31 and aninclination of 7° with respect to theecliptic.[3]Gladman is not far from a prominentKirkwood gap at 2.5 AU, which corresponds to a 3:1orbital resonance with the gas giant Jupiter, where theAlinda asteroid are located. However,Gladman's eccentricity is lower than that of most Alinda asteroids.
It was first observed as1969 AF atCrimea–Nauchnij in January 1969. The asteroid'sobservation arc begins with its first used observation atPalomar in November 1984, one month after its official discovery at Anderson Mesa.[1]
Thisminor planet was named for Canadian astronomerBrett J. Gladman (born 1966),discoverer of minor planets and co-discoverer of 6 irregularmoons of Uranus:Caliban,Sycorax,Prospero,Setebos,Stephano andFerdinand. He participated in surveys oftrans-Neptunian objects. He is also known for his research and modeling on the dynamical evolution and transport ofnear-Earth objects andmeteorites, respectively.[2] The approvednaming citation was published by theMinor Planet Center on 28 July 1999 (M.P.C. 35486).[11]
Gladman has been characterized as a stonyS-type asteroid in the Tholen-like taxonomy of theSmall Solar System Objects Spectroscopic Survey (S3OS2). In their SMASS-like taxonomy, S3OS2 classifiedGladman as an Sk-subtype that transitions to theK-type asteroids.[9]
Three rotationallightcurves ofGladman have been obtained fromphotometric observations.[8][10][12] In October 2014, observations by French amateur astronomerLaurent Bernasconi gave a fragmentary lightcurve with arotation period of 15 hours and brightness variation of 0.21magnitude (U=1+). Subsequent photometric observations by James W. Brinsfield at the Via Capote Observatory (G69) in October 2010, and by astronomers at thePalomar Transient Factory in March 2014, gave an improved period of17.3 (best) and16.1956 hours with a brightness amplitude of 0.50 and 0.25, respectively (U=2/2).[4]
According to the survey carried out by NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission, the asteroid measures 5.839 kilometers in diameter and its surface has analbedo of 0.248,[7][6] while theCollaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 5.9 kilometers with anabsolute magnitude of 13.5.[4]
