Clarissa (minor planet designation: 302 Clarissa) is a typical main belt asteroid.[1] The asteroid was discovered by the French astronomer Auguste Charlois on 14 November 1890 in Nice. The origin of the name is unknown.[3] In 1991, 302 Clarissa was being considered as a possible fly-by target for the Cassini spacecraft, but was later removed from consideration.[4]

302 Clarissa

A three-dimensional model of 302 Clarissa based on its light curve
Discovery
Discovered by	Auguste Charlois
Discovery date	14 November 1890
Designations
MPC designation	(302) Clarissa
Minor planet category	Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	124.04 yr (45,305 d) 124.04 yr (45305 d)
Aphelion	2.67 AU (400.04 Gm)
Perihelion	2.14 AU (319.61 Gm)
Semi-major axis	2.41 AU (359.82 Gm)
Eccentricity	0.11175
Orbital period (sidereal)	3.73 yr (1,362.5 d)
Mean anomaly	213.798°
Mean motion	0° 15m 51.174s / day
Inclination	3.41369°
Longitude of ascending node	7.85637°
Argument of perihelion	54.5926°
Physical characteristics
Dimensions	38.53±3.1 km
Mean density	1.5 g cm−3[2]
Synodic rotation period	14.381 h (0.5992 d)
Geometric albedo	0.0524±0.010
Spectral type	F
Absolute magnitude (H)	10.89

This body is orbiting the Sun with a period of 3.73 years and an eccentricity (ovalness) of 0.11. The orbital plane is inclined by 3.4° to the plane of the ecliptic. There are no major planetary resonances near the orbit of 302 Clarissa. It has a retrograde spin with a rotation period of 14.4797 hours. Stellar occultation data provides a size estimate of 43±4 km,[2] while IRAS data gives a diameter of 38.5±3.1 km. It is classified as a F-type asteroid and is probably composed of carbonaceous material.[1]

302 Clarissa provides the eponym for a small collisional asteroid family of mostly C-type asteroids. This group consists of 179 bodies with orbits clustered around 302 Clarissa. The family has a small extend of semimajor axis values, suggesting this is a young group; its estimated age is 56±5 Myr. 70–90% of the objects in this family have a retrograde spin, suggesting the parent body may have possessed a similar rotation.[2] This family is one of five that are candidate sources for the near Earth asteroids 101955 Bennu and 162173 Ryugu.[5]

Spacecraft visits

At present, Clarissa has not been visited by any spacecraft. As of 1991, mission planning for the Cassini–Huygens spacecraft included a flyby (spaceflight) of Clarissa while leaving the inner solar system in November 1998,[6] however due to delays, the launch of Cassini-Huygens was moved from November 1995 to October 1997, thus negating the option to pass near Clarissa. Cassini-Huygens passed by asteroid 2685 Masursky on 23 January 2000 instead.

References

External links

• 302 Clarissa at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 302 Clarissa at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

[de] (302) Clarissa

[es] (302) Clarissa

[ru] (302) Кларисса