| Discovery[1] | |
|---|---|
| Discovered by | C. Shoemaker |
| Discovery site | Palomar Obs. |
| Discovery date | 13 January 1983 |
| Designations | |
| (4435) Holt | |
| Pronunciation | /ˈhoʊlt/ |
Named after | Henry E. Holt (American astronomer)[2] |
| 1983 AG2 · 1978 PZ2 | |
| Mars-crosser[1][3][4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 37.89 yr (13,840 days) |
| Aphelion | 3.0939AU |
| Perihelion | 1.5405 AU |
| 2.3172 AU | |
| Eccentricity | 0.3352 |
| 3.53yr (1,288 days) | |
| 319.21° | |
| 0° 16m 45.84s / day | |
| Inclination | 21.905° |
| 330.93° | |
| 110.08° | |
| Knownsatellites | 1 |
| Physical characteristics | |
| 5.03±1.17 km[5] 6.44 km(derived)[4] | |
| 2.8670±0.0002 h[4] | |
| 0.20(assumed)[4] 0.28±0.15 km[5] | |
| SMASS =S[1][4] | |
| 13.1[1] · 13.32±0.11[6][7] | |
4435 Holt, provisional designation1983 AG2, is a stonyasteroid, sizableMars-crosser andbinary system from the inner regions of theasteroid belt, approximately 5 kilometers in diameter. It was discovered on 13 January 1983, by American astronomerCarolyn Shoemaker at thePalomar Observatory in California, United States.[3] It was later named after American astronomerHenry E. Holt.[2] The discovery of itscompanion was announced in January 2018.
Holt orbits the Sun in theinner main-belt at a distance of 1.5–3.1 AU once every 3 years and 6 months (1,288 days). Its orbit has aneccentricity of 0.34 and aninclination of 22° with respect to theecliptic.[1] The firstprecovery was taken atCrimea-Nauchnij in 1978, extending the asteroid'sobservation arc by 5 years prior to its discovery.[3]
Thisminor planet was named for Americanplanetary geologist and astronomerHenry E. Holt (born 1929), atNAU andUSGS, who has explored thesurface of the Moon, its geology andphotometric properties during theApollo andSurveyor programs.[2]
After his retirement, Holt was a principal participant in thePalomar Asteroid and Comet Survey (PACS) from 1983 to 1993.[8] Holt has discovered and co-discovered six comets and 683 minor planets between 1989 and 1993,[9] including4581 Asclepius,[10] a potentially hazardous asteroid that has made the closest approach to Earth of all numbered asteroids.[2] The official naming citation was published by theMinor Planet Center on 30 January 1991 (M.P.C. 17656).[11]
In theSMASS classification,Holt is a commonS-type asteroid.[1]
According to the survey carried out by NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Holt measures 5.03 kilometers in diameter and its surface has analbedo of 0.28,[5] while theCollaborative Asteroid Lightcurve Linkassumes a standard albedo for stony asteroids of 0.20 and derives a diameter of 6.44 kilometer with anabsolute magnitude of 13.32.[4][6][7]
In November 2017, a rotationallightcurve ofHolt was obtained fromphotometric observation byRobert Stephens and collaborators. Lightcurve analysis gave arotation period of2.8670±0.0002 hours with a brightness variation of 0.15 magnitude.[4] During the observations, the presence of an approximately 2-kilometer sizedminor-planet moon was detected. The satellite orbits its primary every 42.6 hours (1.777 d).
