(101101) Carmichael Main-belt Asteroid
Discovered on 14 September 1998 by LINEAR at Socorro.
Robert Daniel Carmichael (1879–1967) was an American mathematician known for his research in what are now called the Carmichael numbers, Carmichael's totient function conjecture, Carmichael's theorem, and the Carmichael function—all significant in number theory and in the study of the prime numbers. The smallest palindromic Carmichael number is 101101.Naming citation (WGSBN Bull. 4, #13, 19), IAU / Minor Planet Center, via NASA/JPL
Where Carmichael is today
Seen from above the solar system on 2026-10-14: Carmichael is 2.34 au from the Sun and 1.84 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 101101 |
| Provisional designation | 1998 RO41 |
| Orbit class | Main-belt Asteroid |
| Diameter | 2.27 km (#16,653 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0480 |
| Absolute magnitude (H) | 16.79 |
| Orbital period | 3.43 years |
| Semi-major axis | 2.27 au |
| Perihelion – aphelion | 1.86 – 2.68 au |
| Eccentricity | 0.180 |
| Inclination | 2.90° |
| Closest distance between its orbit and Earth's (MOID) | 0.853 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Robert
- (1955) McMath
- (3514) Hooke
- (3875) Staehle
- (4564) Clayton
- (4809) Robertball
- (5109) Robertmiller
- (5308) Hutchison
- (5477) Holmes
- (5585) Parks
- (5636) Jacobson
- (5739) Robertburns
- (5817) Robertfrazer
All asteroids named after someone called Robert
Also discovered on 14 September 1998
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- (11190) Jennibell
- (12898) Mignard
- (12900) Rishabjain
- (12903) Isabellekatz
- (12906) Alexismacavoy
- (12907) Giannanilvo
- (13301) Hofsteen
- (13302) Kezmoh
- (13303) Asmitakumar
- (13305) Danielang
- (13307) Taralarsen