astro.wikisort.org - Asteroid

(66063) 1998 RO₁ is a stony near-Earth object of the Aten group on a highly-eccentric orbit. The synchronous binary system measures approximately 800 meters (0.50 miles) in diameter. It was discovered by astronomers of the Lincoln Near-Earth Asteroid Research at the Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico, on 14 September 1998.[2]

(66063) 1998 RO₁

Orbit of 1998 RO1
Discovery[1][2]
Discovered by	LINEAR
Discovery site	Lincoln Lab's ETS
Discovery date	14 September 1998
Designations
MPC designation	(66063) 1998 RO1
Alternative designations	1998 RO1 · 1999 SN5
Minor planet category	NEO · Aten[1]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	13.99 yr (5,111 days)
Aphelion	1.7045 AU
Perihelion	0.2774 AU
Semi-major axis	0.9910 AU
Eccentricity	0.7200
Orbital period (sidereal)	0.99 yr (360 days)
Mean anomaly	348.97°
Mean motion	0° 59m 56.76s / day
Inclination	22.678°
Longitude of ascending node	351.88°
Argument of perihelion	151.13°
Known satellites	1 (D: 0.38 km; P: 14.53 h)[3][4][5][6]
Earth MOID	0.0921 AU · 35.9 LD
Physical characteristics
Mean diameter	0.62±0.25 km[7] 0.72 km (est. at 0.20)[8] 0.8±0.15 km[3][9] 0.860 km (derived)[10]
Mean density	2.8±1.3 kg/m3[6]
Synodic rotation period	2.4924±0.0003 h[4] 2.4924 h[5][9]
Geometric albedo	0.145[9] 0.30±0.17[7]
Spectral type	S[10][11][12]
Absolute magnitude (H)	18.00[12] · 18.04[9] · 18.05[10] · 18.05±0.071[13] · 18.1[1]

Its minor-planet moon, provisionally designated S/2001 (66063) 1, was discovered in September 2003. It has an orbital period of 14.53 hours and measures approximately 48% of its primary, or 380 meters.[1][3] It is one of seven known Aten binaries as of 2017.

Interaction with Earth

1998 RO₁'s orbit is very eccentric, with an aphelion beyond the orbit of Mars and a perihelion inside the orbit of Mercury.[3] It has an orbital period of 360.29 days (0.99 years) and makes close approaches to Earth.[1] But 1998 RO₁ makes closer approaches to other inner planets, especially Mars. Its closest approach to a planet between 1950–2200 was to Mars, as it passed 0.00898 AU (1,343,000 km) from Mars on 18 March 1964, and will pass 0.0054 AU (810,000 km) from Mars on 12 October 2065.[1]

Moon

1998 RO₁ has one moon, S/2001 (66063) 1. This moon was discovered from lightcurve observations going from 13 to 28 September 2013, and was confirmed by radar observations from the Arecibo Observatory one year later. It is in a very close orbit to 1998 RO₁, with a semi-major axis of 800 m (2,600 ft) and an eccentricity of 0.06,[3] giving it a periapsis of 752 m (2,467 ft) and an apoapsis of 848 m (2,782 ft). S/2001 (66063) 1 takes 14.54 hours to complete one orbit around 1998 RO₁.[3]

From the surface of 1998 RO₁, S/2001 (66063) 1 would have an apparent diameter of roughly 41°.[lower-alpha 1] For comparison, the Sun appears to be 0.5° from Earth. The secondary orbits its primary in a manner very similar to the adjunct image, where the red cross is the center of mass.

Numbering and naming

This minor planet was numbered by the Minor Planet Center on 10 September 2003.[14] As of 2018, it has not been named.[2]

Notes

References

External links

• Binary and Ternary Near-Earth Asteroids Detected by Radar, Lance Benner, JPL
• Asteroids with Satellites, Robert Johnston, johnstonsarchive.net
• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• (66063) 1998 RO1 at NeoDyS-2, Near Earth Objects—Dynamic Site
  • Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
• (66063) 1998 RO1 at ESA–space situational awareness
  • Ephemerides · Observations · Orbit · Physical Properties · Summary
• (66063) 1998 RO1 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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