astro.wikisort.org - Asteroid

(416151) 2002 RQ₂₅ is a carbonaceous asteroid of the Apollo group, classified as near-Earth object and potentially hazardous asteroid, approximately 0.2 kilometers in diameter. It was discovered on 3 September 2002, by the Campo Imperatore Near-Earth Object Survey (CINEOS) at the Italian Campo Imperatore Observatory, located in the Abruzzo region, east of Rome.[2]

(416151) 2002 RQ₂₅

Discovery[1]
Discovered by	CINEOS
Discovery site	Campo Imperatore Obs.
Discovery date	3 September 2002
Designations
MPC designation	(416151) 2002 RQ25
Alternative designations	2002 RQ25
Minor planet category	Apollo · NEO[1] · PHA[2]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	14.13 yr (5,160 days)
Aphelion	1.4523 AU
Perihelion	0.7711 AU
Semi-major axis	1.1117 AU
Eccentricity	0.3064
Orbital period (sidereal)	1.17 yr (428 days)
Mean anomaly	8.4222°
Mean motion	0° 50m 26.88s / day
Inclination	4.5766°
Longitude of ascending node	10.520°
Argument of perihelion	225.68°
Earth MOID	0.0499 AU · 19.4 LD
Physical characteristics
Mean diameter	0.225 km (calculated)[3]
Synodic rotation period	12.191±0.005 h[4]
Geometric albedo	0.20 (assumed)[3]
Spectral type	C[3] · C/X[5]
Absolute magnitude (H)	20.6[1][3]

Orbit and classification

2002 RQ₂₅ orbits the Sun at a distance of 0.8–1.5 AU once every 1 years and 2 months (428 days). Its orbit has an eccentricity of 0.31 and an inclination of 5° with respect to the ecliptic.[1]

The asteroid's minimum orbit intersection distance with Earth is 0.0499 AU (7,460,000 km), which is currently exactly at the threshold limit of 0.05 AU (or about 19.5 lunar distances) to make it a potentially hazardous object.[1]

Physical characteristics

The carbonaceous C-type asteroid is also classified as a C/X-type body according to the survey carried out by NASA's Spitzer Space Telescope.[5]

Lightcurve

A rotational lightcurve of 2002 RQ₂₅ was obtained from photometric observations made by American astronomer Brian Warner at his Palmer Divide Observatory, Colorado, in February 2015. The ambiguous lightcurve rendered a rotation period of 12.191±0.005 hours with a brightness variation of 0.72 magnitude (U=2+), while a second solution gave 6.096 hours (or half of the first period) with an amplitude of 0.43.[4]

The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates diameter of 225 meters with an absolute magnitude of 20.6.[3]

Naming

As of 2017, this minor planet remains unnamed.[2]

References

External links

• The Palmer Divide Observatory: Tour given by Brian Warner on YouTube (time 4:03 min.)
• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• (416151) 2002 RQ25 at NeoDyS-2, Near Earth Objects—Dynamic Site
  • Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
• (416151) 2002 RQ25 at ESA–space situational awareness
  • Ephemerides · Observations · Orbit · Physical Properties · Summary
• (416151) 2002 RQ25 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

---