22899 Alconrad
| Discovery | |
|---|---|
| Discovered by |
K. Korlević M. Jurić |
| Discovery site | Višnjan Obs. |
| Discovery date | 11 October 1999 |
| Designations | |
| MPC designation | (22899) Alconrad |
|
Named after
|
Albert R. Conrad (astronomer, AO-expert) |
| 1999 TO14 · 1998 ML48 | |
| main-belt · Koronis | |
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 21.57 yr (7,877 days) |
| Aphelion | 3.0789 AU |
| Perihelion | 2.6099 AU |
| 2.8444 AU | |
| Eccentricity | 0.0824 |
| 4.80 yr (1,752 days) | |
| 259.89° | |
| 0° 12m 19.8s / day | |
| Inclination | 2.8820° |
| 136.00° | |
| 220.55° | |
| Known satellites | 1 |
| Physical characteristics | |
| Dimensions |
4.5 km 4.94 km (calculated) 5.682±0.471 km |
|
4.03±0.03 h 5.0206±0.0029 h |
|
|
0.181±0.029 0.21 0.24 (assumed) |
|
| S | |
|
13.677±0.004 (R) 13.7 · 13.8 13.96±0.25 |
|
22899 Alconrad, provisional designation 1999 TO14, is a binary Koronian asteroid from the outer region of the asteroid belt, approximately 5 kilometers in diameter. It was discovered on 11 October 1999, by Croatian astronomers Korado Korlević and Mario Jurić at the Višnjan Observatory, Croatia.
When the asteroid moon, provisionally designated S/2003 (22899) 1, was discovered in 2003, it was the smallest known binary system in the main-belt. It was later named after American astronomer Albert R. Conrad.
The stony S-type asteroid belongs to the Koronis family, a collisional group consisting of a few hundred known bodies with nearly ecliptical orbits. It orbits the Sun at a distance of 2.6–3.1 AU once every 4 years and 10 months (1,752 days). Its orbit has an eccentricity of 0.08 and an inclination of 3° with respect to the ecliptic. A precovery was taken by Steward Observatory's Spacewatch program in 1994, extending Alconrad's observation arc by 5 years prior to its discovery observation.
In December 2009, a rotational lightcurve was obtained from photometric observations at the ground-based Wise Observatory in Mitzpe Ramon, Israel. The light-curve gave it a rotation period of 4.03±0.03 hours with a brightness variation of 0.19±0.03 in magnitude (U=2). In October 2013, another observation in the R-band by astronomers at the Palomar Transient Factory, California, derived a longer period of 5.0206±0.0029 with an amplitude of 0.14 magnitude (U=2).
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