(88710) 2001 SL9

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(88710) 2001 SL9
Orbit of 88710.gif
Orbit of 2001 SL9
Discovery [1] [2]
Discovered by NEAT
Discovery site Palomar Obs.
Discovery date18 September 2001
Designations
2001 SL9
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 22318 days (61.10 yr)
Aphelion 1.3480  AU (201.66  Gm)
Perihelion 0.77471 AU (115.895 Gm)
1.0613 AU (158.77 Gm)
Eccentricity 0.27006
1.09 yr (399.37 d)
239.06°
0° 54m 5.112s / day
Inclination 21.900°
202.86°
329.30°
Known satellites 1
Earth  MOID 0.197987 AU (29.6184 Gm)
Jupiter  MOID 3.64009 AU (544.550 Gm)
Physical characteristics
Mean diameter
1 km (0.62 mi) [3]
Mass 109 mt
Mean density
1.8 g/cm3 [2]
Equatorial surface gravity
0.02565 mm/s2 [4]
Equatorial escape velocity
0.05116 mm/s [4]
2.4004  h (0.10002  d)
2.40035±0.00005 hours [1] [5]
0.16 [2]
Temperature 230-303 K (-43-30°C) [4]
17.6 [1]

    (88710) 2001 SL9 (provisional designation 2001 SL9) is a sub-kilometer asteroid and binary system, classified as near-Earth object of Apollo group [1] discovered by NEAT at Palomar Observatory on 18 September 2001. It measures approximately 960 meters in diameter, while its 2001-discovered minor-planet moon has an estimated diameter of 200 meters based on a secondary to primary mean-diameter ration of 0.28. [2]

    Contents

    Near-Earth asteroid

    Although 2001 SL9 is classified as a near-Earth object, it does not pose any threats. It has never, nor will it ever in the next century, come closer than 15,000,000 km (0.1 AU) from Earth or Venus. [1] However, the asteroid would make a good target for a spacecraft flyby, as a flyby to 2001 SL9 would only require a delta-v of 5.4 km/s. [6]

    Moon

    2001 SL9 has one minor-planet moon, S/2001 (88710) 1. It was discovered from lightcurve observations [6] made by Czech astronomer Petr Pravec and collaborators. [2] This moon is approximately 200 m (660 ft) in diameter. Its semi-major axis is 1.6 km (0.99 mi) and its orbital period is 16.4 hours. [2]

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    References

    1. 1 2 3 4 5 6 "88710 (2001 SL9)". JPL Small-Body Database . Jet Propulsion Laboratory. SPK-ID:  2088710 . Retrieved 7 April 2016.
    2. 1 2 3 4 5 6 Johnston, Robert (1 September 2005). "(88710) 2001 SL9". Johnston Archive. Retrieved 26 December 2013.
    3. "Asteroids Do Have Satellites". Asteroids III. 2002. Bibcode:2002aste.book..289M.
    4. 1 2 3 "HEC: Exoplanets Calculator". Planetary Habitability Laboratory. University of Puerto Rico. Archived from the original on 5 September 2019. Retrieved 27 December 2013.
    5. Green, Daniel (3 November 2001). "IAUC 7742: 2001fd; 2001fe; 2001 SL_9". International Astronomical Union. Harvard University . Retrieved 27 December 2013.
    6. 1 2 Benner, Lance (14 December 2004). "BINARY NEAR-EARTH ASTEROIDS DETECTED BY RADAR". Jet Propulsion Laboratory. Archived from the original on 20 September 2020. Retrieved 30 December 2013.