| Discovery[1] | |
|---|---|
| Discovered by | E. F. Helin K. J. Lawrence |
| Discovery site | Palomar Obs. |
| Discovery date | 22 June 1993 |
| Designations | |
| (5836) 1993 MF | |
| 1993 MF | |
| Amor · NEO[1][2] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 35.90 yr (13,112 days) |
| Aphelion | 3.7489AU |
| Perihelion | 1.1311 AU |
| 2.4400 AU | |
| Eccentricity | 0.5364 |
| 3.81yr (1,392 days) | |
| 107.39° | |
| 0° 15m 30.96s / day | |
| Inclination | 7.9497° |
| 238.78° | |
| 77.974° | |
| Earth MOID | 0.1842 AU · 71.8LD |
| Physical characteristics | |
| Dimensions | 2.79 km(derived)[3] 3.8 km[4] |
| 4.948±0.005h[a] 4.9543±0.0002 h[b] 4.959 h[4] 4.96±0.01 h[5] | |
| 0.20(assumed)[3] | |
| SMASS =S[1] · S[3] | |
| 14.65±0.2(R)[b] · 14.7[1] · 15.01±0.16[5] · 15.03±0.05[4] · 15.141±0.139[3][6] · 15.43±0.40[7] | |
(5836) 1993 MF is a highly eccentric, stonyasteroid, classified as anear-Earth object of theAmor group of asteroids, approximately 3 kilometers in diameter. It was discovered on 22 June 1993, by American astronomersEleanor Helin andKenneth Lawrence at the U.S.Palomar Observatory in California.[2]
The stonyS-type asteroid orbits the Sun at a distance of 1.1–3.7 AU once every 3 years and 10 months (1,392 days). Its orbit has aneccentricity of 0.54 and aninclination of 8° with respect to theecliptic.[1] It has an Earthminimum orbital intersection distance of nearly 0.184 AU (27,500,000 km), which corresponds to 71.8lunar distances. As it crosses the orbit of Mars, it may also be classified as aMars-crosser, and, on 28 November 2023, it will pass 0.02535 AU (3,792,000 km) from the Red Planet.[1] The firstprecovery was taken at the AustralianSiding Spring Observatory in 1981, extending the body'sobservation arc by 12 years prior to its discovery.[2]
Since the 1990s, and up to June 2016, four well-defined rotationallightcurves were obtained for this asteroid fromphotometric observations, giving arotation period of approximately 4.95 hours with a high brightness variation between 0.53 and 0.82 inmagnitude, indicating that the asteroid has a non-spheroidal shape. In the 1990s, Italian astronomerStefano Mottola obtained a lightcurve atLa Silla during the EUNEASO, a European near-Earth object search and follow-up observation program to determine additional physical parameters (U=3).[4]
Further lightcurves were obtained by Polish astronomerWiesław Z. Wiśniewski atUA'sLPL in October 1993, and by Czech astronomerPetr Pravec atOndřejov Observatory in September 1997 (U=3/3).[5][b] In June 2016, the fourth and most recent photometric observation was made by American astronomerBrian Warner at his Palmer Divide Station, Colorado, which gave a period of4.948±0.005 hours with an amplitude of 0.82 in magnitude (U=3).[a]
While in the 1990s, Stefano Mottola estimated the asteroid to measure 3.8 kilometers in diameter (H = 15.03),[4] theCollaborative Asteroid Lightcurve Link assumes a standardalbedo for stony asteroids of 0.20 and derives a shorter diameter of 2.8 kilometers, based on an absolute magnitude of 15.14.[3]
