Astronomy:996 Hilaritas
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Short description: Main-belt asteroid
| Discovery | |
|---|---|
| Discovered by | J. Palisa |
| Discovery site | Vienna |
| Discovery date | 21 March 1923 |
| Designations | |
| (996) Hilaritas | |
| Pronunciation | /hɪˈlærɪtæs/ |
| 1923 NM | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 88.16 yr (32200 days) |
| |{{{apsis}}}|helion}} | 3.5220 astronomical unit|AU (526.88 Gm) |
| |{{{apsis}}}|helion}} | 2.6535 AU (396.96 Gm) |
| 3.0878 AU (461.93 Gm) | |
| Eccentricity | 0.14063 |
| Orbital period | 5.43 yr (1981.8 d) |
| Mean anomaly | 93.831° |
| Mean motion | 0° 10m 53.94s / day |
| Inclination | 0.65948° |
| Longitude of ascending node | 347.404° |
| 147.140° | |
| Physical characteristics | |
| Mean radius | 14.765±0.65 km |
| Rotation period | 10.05 h (0.419 d) |
| Geometric albedo | 0.0901±0.009 |
| Absolute magnitude (H) | 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.[2]
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.[3]
References
- ↑ "996 Hilaritas (1923 NM)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=996;cad=1.
- ↑ Schmadel, Lutz D. (2012), Dictionary of Minor Planet Names (6th ed.), Springer, p. 85, ISBN 3642297188, https://books.google.com/books?id=aeAg1X7afOoC&pg=PA85.
- ↑ Strabla, Luca; Quadri, Ulisse; Girelli, Roberto (January 2011), "Lightcurve Analysis of 996 Hilaritas", The Minor Planet Bulletin 38 (1): 14–15, Bibcode: 2011MPBu...38...14S.
External links
- 996 Hilaritas at AstDyS-2, Asteroids—Dynamic Site
- 996 Hilaritas at the JPL Small-Body Database
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