| Discovery[1] | |
|---|---|
| Discovered by | C. Shoemaker |
| Discovery site | Palomar Obs. |
| Discovery date | 9 May 1988 |
| Designations | |
| (4451) Grieve | |
Named after | Richard Grieve[1] (Canadian geologist) |
| 1988 JJ · 1971 GF 1980 VE1 | |
| Mars-crosser[1][2] | |
| Orbital characteristics[3] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 63.12yr (23,053 d) |
| Aphelion | 3.6024AU |
| Perihelion | 1.6064 AU |
| 2.6044 AU | |
| Eccentricity | 0.3832 |
| 4.20 yr (1,535 d) | |
| 348.28° | |
| 0° 14m 4.2s / day | |
| Inclination | 27.799° |
| 219.38° | |
| 110.23° | |
| Mars MOID | 0.4477 AU |
| Physical characteristics | |
| 12.16±2.43 km[4] | |
| 6.864±0.006 h[5] | |
| 0.189[4] | |
| SMASS =S[3][2] Svw(Bus–DeMeo)[6] | |
| 12.00[1][3][2][4] | |
4451 Grieve, provisional designation1988 JJ, is a stonyasteroid and largeMars-crosser on an eccentric orbit from the centralasteroid belt, approximately 12 kilometers (7.5 miles) in diameter. It was discovered on 9 May 1988, by American astronomerCarolyn Shoemaker at thePalomar Observatory in California.[1] TheS-type asteroid is likely elongated and has arotation period of 6.9 hours.[2] It was named for Canadian geologistRichard Grieve.[1]
Grieve is aMars-crossing asteroid, crossing the orbit ofMars at 1.666 AU. Members of this dynamically unstable group are located between themain belt andnear-Earth populations. It orbits the Sun at a distance of 1.6–3.6 AU once every 4 years and 2 months (1,535 days;semi-major axis of 2.6 AU). Its orbit has aneccentricity of 0.38 and aninclination of 28° with respect to theecliptic.[3] The body'sobservation arc begins with aprecovery taken at Palomar in 1954, or 34 years prior to its official discovery observation.[1]
In theSMASS classification,Grieve is a common, stonyS-type asteroid.[3] In theBus-DeMeo taxonomy it is a Svw-type.[6]
Thisminor planet was named after Canadian geologistRichard Grieve, chief of geophysics with theGeological Survey of Canada. He is a leading investigator of terrestrial andlunar impact craters and maintains the global census of recognizedimpact structures on Earth. Grieve has led the effort to reliably determine the ages for these structures and has classified impacts in molten rocks based on the abundance and distribution ofsiderophile elements.[1] The official naming citation was published by theMinor Planet Center on 30 January 1991 (M.P.C. 17657).[7]
In October 2001, a rotationallightcurve ofGrieve was obtained fromphotometric observations by American astronomerEdwin E. Sheridan at the Crescent Butte Observatory (682) in Utah. Lightcurve analysis gave arotation period of6.864±0.006 hours with a brightness amplitude of 0.90magnitude (U=3).[5] Alternative observations byRobert Stephens (6.85 h) andPierre Antonini (6.8607 h) were very similar (U=3/3).[8]
6.8607±0.0002 h[9] The lightcurve's high brightness variation is indicative of an elongated shape.
According to the survey carried out by theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Grieve measures 12.16 kilometers in diameter and its surface has analbedo of 0.189.[4] TheCollaborative Asteroid Lightcurve Link assumes an albedo of 0.20 and calculates a diameter of 11.83 kilometers based on anabsolute magnitude of 12.0.[2]
This makesGrieve one of the largestMars-crossing asteroids (MCAs) comparable with1310 Villigera (13.76 km), as most mid-sized MCA's measure below 10 kilometers such as1139 Atami (9.35 km),1474 Beira (14.9 km),1011 Laodamia (7.5 km),1727 Mette (5.44 km),1131 Porzia (7 km),1235 Schorria (5.55 km),985 Rosina (8.18 km) and1468 Zomba (7 km). However, largest members of this dynamical group, namely,132 Aethra,1508 Kemi,2204 Lyyli and512 Taurinensis are all larger than 20 kilometers in diameter.[4]
