2324 Janice
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| Discovery[1] | |
|---|---|
| Discovered by | E. F. Helin S. J. Bus |
| Discovery site | Palomar Obs. |
| Discovery date | 7 November 1978 |
| Designations | |
| (2324) Janice | |
Named after | Janice Cline [1] (Supporter at Caltech) |
| 1978 VS4 · 1929 WH 1934 VR · 1949 ME 1961 UP · 1971 OC1 1975 EM2 · 1977 RY4 A911 MC | |
| main-belt[1][2] · (outer) background[3] · Themis[4][5] | |
| Orbital characteristics[2] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 83.28 yr (30,418 d) |
| Aphelion | 3.6382 AU |
| Perihelion | 2.5282 AU |
| 3.0832 AU | |
| Eccentricity | 0.1800 |
| 5.41 yr (1,977 d) | |
| 245.72° | |
| 0° 10m 55.56s / day | |
| Inclination | 0.3995° |
| 315.66° | |
| 305.63° | |
| Physical characteristics | |
| 23.55 km (calculated)[4] 24.33±6.61 km[6] 24.44±1.22 km[7] 25.76±7.43 km[8] 28.463±0.354 km[9] 28.532±0.238 km[10] 28.9±15.91 km[11] 31.19±15.91 km[12] | |
| 23.2±0.1 h[11] | |
| 0.038±0.004[10] 0.050±0.040[12] 0.06±0.04[6] 0.0601±0.0049[9] 0.07±0.03[8] 0.08 (assumed)[4] 0.093±0.010[7] | |
| C (assumed)[4] | |
| 11.30[7] · 11.40[8][9][12] 11.46±0.36[13] · 11.5[2][4] 11.68[6] | |
2324 Janice, provisional designation 1978 VS4, is a dark background asteroid from the outer regions of the asteroid belt, approximately 25 kilometers (16 miles) in diameter. It was discovered on 7 November 1978, by American astronomers Eleanor Helin and Schelte Bus at the Palomar Observatory in California.[1] The asteroid was named for Janice Cline at Caltech. The presumably C-type asteroid has a rotation period of 23.2 hours.[4]
Based on osculating Keplerian orbital elements, Janice is located in the region of the Themis family (602), a very large family of carbonaceous asteroids, named after 24 Themis.[4]
When applying the hierarchical clustering method to its proper orbital elements, the object is both a non-family asteroid of the main belt's background population (according to Nesvorný),[3] as well as a core member of the Themis family (according to Milani and Knežević).[5]
It orbits the Sun in the outer main-belt at a distance of 2.5–3.6 AU once every 5 years and 5 months (1,977 days; semi-major axis of 3.08 AU). Its orbit has an eccentricity of 0.18 and an inclination of 0° with respect to the ecliptic.[2] The body's observation arc begins with its first observation as A911 MC at Lowell Observatory in June 1911, more than 67 years prior to its official discovery observation at Palomar.[1]
Physical characteristics
Janice is a presumed carbonaceous C-type asteroid which is the overall spectral type of members of the Themis family (602).[4]
Rotation period
In October 2010, a rotational lightcurve of Janice was obtained from photometric observations by Gordon Gartrelle at the University of North Dakota Observatory in Grand Forks (730). Lightcurve analysis gave a tentative rotation period of 23.2 hours with a brightness amplitude of 0.19 magnitude (U=2-).[11] As of 2018, no secure period has been obtained.[4]
Diameter and albedo
According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Janice measures between 24.33 and 31.19 kilometers in diameter and its surface has an albedo between 0.038 and 0.093.[6][7][8][9][10][12]
The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.08 and calculates a diameter of 23.55 kilometers based on an absolute magnitude of 11.5.[4]
