(89830) 2002 CE, provisional designation 2002 CE, is a stony asteroid, classified as near-Earth object and potentially hazardous asteroid of the Amor group, approximately 3.1 kilometers in diameter. It was discovered on 1 February 2002, by astronomers of the LINEAR program at Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico, in the United States.[2] This asteroid is one of the largest potentially hazardous asteroid known to exist.[7]
| Discovery[1] | |
|---|---|
| Discovered by | LINEAR |
| Discovery site | Lincoln Lab's ETS |
| Discovery date | 1 February 2002 |
| Designations | |
MPC designation | (89830) 2002 CE |
Alternative designations | 2002 CE |
Minor planet category | Amor · NEO · PHA[1][2] |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 34.91 yr (12,752 days) |
| Aphelion | 3.1314 AU |
| Perihelion | 1.0234 AU |
Semi-major axis | 2.0774 AU |
| Eccentricity | 0.5074 |
Orbital period (sidereal) | 2.99 yr (1,094 days) |
Mean anomaly | 117.79° |
Mean motion | 0° 19m 45.12s / day |
| Inclination | 43.701° |
Longitude of ascending node | 19.934° |
Argument of perihelion | 5.7062° |
| Earth MOID | 0.0277 AU · 10.8 LD |
| Physical characteristics | |
Mean diameter | 3.11 km (calculated)[3] 5.067±2.155 km[4] |
Synodic rotation period | 2.6149±0.0008 h[lower-alpha 1] |
Geometric albedo | 0.079±0.075[4] 0.20 (assumed)[3] |
Spectral type | S[3][5] |
Absolute magnitude (H) | 14.80±0.3[4] · 14.9[1][2][3] · 15.67±0.27[6] |
2002 CE is a member of the dynamical Amor group, which are Mars-crossing asteroids that approach the orbit of Earth from beyond, but do not cross it.[1][2]
It orbits the Sun at a distance of 1.0–3.1 AU once every 2 years and 12 months (1,094 days; semi-major axis of 2.08 AU). Its orbit has a high eccentricity of 0.51 and an inclination of 44° with respect to the ecliptic.[1]
The body's observation arc begins with a precovery from the Digitized Sky Survey taken at the Siding Spring Observatory, Australia, in May 1982, nearly 20 years prior to its official discovery observation at Socorro.[2]
With an absolute magnitude of 14.9, 2002 CE is one of the brightest and largest known potentially hazardous asteroid (see PHA-list).[7] It has an Earth minimum orbital intersection distance of 0.0277 AU (4,140,000 km), which corresponds to 10.8 lunar distances.[1]
2002 CE has been characterized as a common, stony S-type asteroid by astronomers conducting spectroscopic observations using the New Technology Telescope at La Silla, Chile, and the 2.2-meter telescope of the Calar Alto Observatory in Spain.[5]: 6
In October 2004, a rotational lightcurve of 2002 CE was obtained from photometric observations by Czech astronomer Petr Pravec at the Ondřejov Observatory. Lightcurve analysis gave a rotation period of 2.6149 hours with a low brightness amplitude of 0.09 magnitude (U=2-). Several longer periods are also possible.[lower-alpha 1]
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, 2002 CE measures 5.067 kilometers in diameter and its surface has a low albedo of 0.079.[4] Conversely, the Collaborative Asteroid Lightcurve Link assumes a stony standard albedo of 0.20 and calculates a smaller diameter of 3.11 kilometers based on an absolute magnitude of 14.9.[3]
This minor planet was numbered by the Minor Planet Center on 30 August 2004.[8] As of 2018, it has not been named.[2]
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