996 Hilaritas

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]

996 Hilaritas
Discovery
Discovered byJ. Palisa
Discovery siteVienna
Discovery date21 March 1923
Designations
(996) Hilaritas
Pronunciation/hɪˈlærɪtæs/
1923 NM
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc88.16 yr (32200 days)
Aphelion3.5220 AU (526.88 Gm)
Perihelion2.6535 AU (396.96 Gm)
3.0878 AU (461.93 Gm)
Eccentricity0.14063
5.43 yr (1981.8 d)
93.831°
0° 10m 53.94s / day
Inclination0.65948°
347.404°
147.140°
Physical characteristics
Mean radius
14.765±0.65 km
10.05 h (0.419 d)
0.0901±0.009
10.88

    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

    1. "996 Hilaritas (1923 NM)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 2 May 2016.
    2. Schmadel, Lutz D. (2012), Dictionary of Minor Planet Names (6th ed.), Springer, p. 85, ISBN 3642297188.
    3. 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.


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