![]() Shape model of Riceia from its
lightcurve | |
Discovery [1] | |
---|---|
Discovered by | K. Reinmuth |
Discovery site | Heidelberg Obs. |
Discovery date | 9 October 1931 |
Designations | |
(1230) Riceia | |
Pronunciation | /ˈraɪsiə/ |
Named after | Hugh Rice
[2] (U.S. amateur astronomer) |
1931 TX1 · 1964 TS 1964 UE · 1975 HH | |
main-belt · (
inner)
[3] background [4] | |
Orbital characteristics [1] | |
Epoch 4 September 2017 ( JD 2458000.5) | |
Uncertainty parameter 0 | |
Observation arc | 86.13 yr (31,459 days) |
Aphelion | 3.0335 AU |
Perihelion | 2.1104 AU |
2.5719 AU | |
Eccentricity | 0.1795 |
4.12 yr (1,507 days) | |
288.81 ° | |
0° 14m 20.4s / day | |
Inclination | 10.515° |
200.55° | |
185.25° | |
Physical characteristics | |
Dimensions | 6.194±0.344 km
[5] 7.46 km (calculated) [3] |
6.67317±0.00001 h [6] | |
0.20 (assumed)
[3] 0.318±0.037 [5] | |
S [3] [7] | |
12.90 [5] · 13.0 [1] [3] · 13.11±0.22 [7] | |
1230 Riceia, provisional designation 1931 TX1, is a stony background asteroid from the central regions of the asteroid belt, approximately 6 kilometers in diameter. It was discovered on 9 October 1931, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory. [8] The asteroid was named after Hugh Rice, amateur astronomer of New York and director of the Museum of Natural Sciences. [2]
Riceia is a non- family asteroid from the main belt's background population. [4] It orbits the Sun in the central asteroid belt at a distance of 2.1–3.0 AU once every 4 years and 1 month (1,507 days; semi-major axis of 2.57 AU). Its orbit has an eccentricity of 0.18 and an inclination of 11 ° with respect to the ecliptic. [1]
The body's observation arc begins at Heidelberg on 17 October 1931, or eight days after its official discovery observation. [8]
Riceia has been characterized as a stony S-type asteroid by Pan-STARRS photometric survey. [7]
In 2016, a rotational lightcurve of Riceia was modeled from photometric data from the Lowell Photometric Database. Lightcurve analysis gave a sidereal rotation period of 6.67317 hours as well as a spin axis of (37.0°, −63.0°) in ecliptic coordinates (λ, β). [6]
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Riceia measures 6.19 kilometers in diameter and its surface has a high albedo of 0.318. [5] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 7.46 kilometers based on an absolute magnitude of 13.0. [3]
This minor planet was named after American amateur astronomer Hugh Rice, director of the Museum of Natural Sciences (possibly AMNH). [2] The naming was proposed by Irving Meyer and endorsed by German astronomer Gustav Stracke who mentioned on a postcard in February 1937, that his American college, Meyer, who himself did not discover any asteroids, requested the naming after the city of Rutherford, where a private observatory was located at the time. [9]
The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 ( H 113). [2]