astro.wikisort.org - Asteroid

(75482) 1999 XC₁₇₃ is a stony Vestian asteroid and an exceptionally slow rotating body from the inner regions of the asteroid belt, approximately 3 kilometers in diameter. It was discovered on 10 December 1999, by LINEAR at Lincoln Laboratory's Experimental Test Site in Socorro, New Mexico, United States.[4]

(75482) 1999 XC₁₇₃

Discovery[1]
Discovered by	LINEAR
Discovery site	Lincoln Lab's ETS
Discovery date	10 December 1999
Designations
MPC designation	(75482) 1999 XC173
Alternative designations	1999 XC173 · 2001 KY49
Minor planet category	main-belt · Vestian[2]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	16.82 yr (6,143 days)
Aphelion	2.5436 AU
Perihelion	2.1844 AU
Semi-major axis	2.3640 AU
Eccentricity	0.0760
Orbital period (sidereal)	3.63 yr (1,328 days)
Mean anomaly	310.28°
Mean motion	0° 16m 16.32s / day
Inclination	6.1205°
Longitude of ascending node	58.882°
Argument of perihelion	48.553°
Physical characteristics
Dimensions	2.96 km (calculated)[2]
Synodic rotation period	1234.1709±89.9916 h[3]
Geometric albedo	0.20 (assumed)[2]
Spectral type	S[2]
Absolute magnitude (H)	14.5[1] · 14.557±0.004 (R)[3] · 15.01[2]

Classification and orbit

The body is classified as a S-type member of the Vesta family by the Collaborative Asteroid Lightcurve Link's Light Curve Data Base (LCDB) .[2] It orbits the Sun at a distance of 2.2–2.5 AU once every 3 years and 8 months (1,328 days). Its orbit has an eccentricity of 0.08 and an inclination of 6° with respect to the ecliptic.[1] A first precovery was obtained at the discovering observatory in October 1999, extending the asteroid's observation arc by 2 months prior to its official discovery observation.[4]

Physical characteristics

A rotational lightcurve was obtained for this asteroid from photometric observations at the Californian Palomar Transient Factory in September 2013. It gave a rotation period of 1234 hours with an estimated error margin of ±90 hours. As of 2016^[update], it is the 6th slowest rotating minor planet known to exist. Its high brightness variation of 0.69 magnitude indicates that it has a non-spheroidal shape (U=2).[3]

According to the LCDB, the body's surface has an assumed standard albedo for stony asteroids of 0.20 and a calculated diameter of 2.96 kilometers with an absolute magnitude of 15.01.[2]

Numbering and naming

This minor planet was numbered by the Minor Planet Center on 15 April 2004.[5] As of 2018, it has not been named.[4]

References

External links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 2017-12-16 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (75001)-(80000) – Minor Planet Center
• (75482) 1999 XC173 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

---