(89830) 2002 CE

(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]

(89830) 2002 CE

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[a]
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]

Orbit and classification

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]

Close approaches

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]

Physical characteristics

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

Rotation period

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.^[a]

Diameter and albedo

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]

Numbering and naming

This minor planet was numbered by the Minor Planet Center on 30 August 2004.^[8] As of 2018, it has not been named.^[2]

Notes

1. Pravec (2004) web: rotation period 2.6149±0.0008 hours with a brightness amplitude of 0.09 mag. Summary figures for (89830) 2002 CE at the LCEB and Pravec, P.; Wolf, M.; Sarounova, L. (2004). Quality Code of 2−. Observation period: 11–23 October 2004. Observer's comment (Pravec): several longer periods are also possible (see Ondrejov data)