996 Hilaritas
| Discovery | |
|---|---|
| Discovered by | J. Palisa |
| Discovery site | Vienna |
| Discovery date | 21 March 1923 |
| Designations | |
| MPC designation | (996) Hilaritas |
| 1923 NM | |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 88.16 yr (32200 days) |
| Aphelion | 3.5220 AU (526.88 Gm) |
| Perihelion | 2.6535 AU (396.96 Gm) |
| 3.0878 AU (461.93 Gm) | |
| Eccentricity | 0.14063 |
| 5.43 yr (1981.8 d) | |
| 93.831° | |
| 0° 10m 53.94s / day | |
| Inclination | 0.65948° |
| 347.404° | |
| 147.140° | |
| Earth MOID | 1.66636 AU (249.284 Gm) |
| Jupiter MOID | 1.52147 AU (227.609 Gm) |
| Jupiter Tisserand parameter | 3.210 |
| Physical characteristics | |
|
Mean radius
|
14.765±0.65 km |
| 10.05 h (0.419 d) | |
| 0.0901±0.009 | |
| 10.88 | |
996 Hilaritas is a Themistian asteroid. It was discovered in 1923 by Austrian astronomer Johann Palisa. Following Palisa's death in 1925, this asteroid was named for a "happy or contented mind"; qualities associated with the discoverer.
Photometric observations of this asteroid collected during 2010 show a rotation period of 10.052 ± 0.001 hours with a brightness variation of 0.65 ± 0.03 magnitude.
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