(185851) 2000 DP107
Composite of radar images by the Arecibo Observatory from September to October 2000
Discovery[1]
Discovered byLINEAR
Discovery siteLincoln Lab's ETS
Discovery date29 February 2000
Designations
(185851) 2000 DP107
2000 DP107
NEO · PHA · Apollo[1][2]
Orbital characteristics[2]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc16.82 yr (6,143 days)
Aphelion1.8794 AU
Perihelion0.8511 AU
1.3652 AU
Eccentricity0.3766
1.60 yr (583 days)
255.78°
0° 37m 4.44s / day
Inclination8.6718°
358.70°
289.74°
Known satellites1
Earth MOID0.0150 AU · 5.8 LD
Physical characteristics
Dimensions0.860 km (taken)[3]
0.863±0.043 km[4]
1.0±0.1 km[5]
2.769±0.005 h[6]
2.774±0.001 h[7]
2.77447±0.00005 h[8]
2.7745±0.0007 h[4]
2.7754±0.0002 h[9]
2.7754 h[10]
0.111±0.036[5]
0.15 (derived)[3]
M[11] · C[3][12]
18.0[10] · 18.0±0.2 (R)[6] · 18.02±0.2[3][13] · 18.03±0.1[5] · 18.2[2]

    (185851) 2000 DP107 is a sub-kilometer sized asteroid, classified as potentially hazardous asteroid and near-Earth object of the Apollo group that is notable because it provided evidence for binary asteroids in the near-Earth population. The PROCYON probe developed by JAXA and the University of Tokyo was intended to flyby this asteroid before its ion thruster failed and could not be restarted.

    Discovery

    The asteroid was discovered on 29 February 2000, by the Lincoln Near-Earth Asteroid Research (LINEAR) program at Lincoln Laboratory's Experimental Test Site, near Socorro, New Mexico.[1]

    The binary nature of this asteroid was suggested from radar observations taken with the Goldstone radar antenna on September 22 and 23, 2000, based on an observing proposal by J.-L. Margot and observations by S. J. Ostro and colleagues.[14] Confirming observations were obtained with the Arecibo telescope from September 30 to October 7, 2000.[15]

    Orbit

    2000 DP107 orbits the Sun at a distance of 0.9–1.9 AU once every 19 months (583 days). Its orbit has an eccentricity of 0.38 and an inclination of 9° with respect to the ecliptic.[2] The body's observation arc begins with its official discovery observation, as no precoveries were taken, and no prior identifications were made.[1]

    Binary system

    The 800-meter-diameter primary and the 300-meter-diameter secondary orbit each other with a separation of 2.6 kilometers and a period of 1.76 days.[16]

    The primary is spheroidal and is spinning at a rate near the breakup point for strengthless bodies. These two features were observed in multiple binary systems, suggesting that near-Earth asteroid binaries form by a mechanism involving spin-up and mass shedding.[16] Currently the most generally accepted spin-up mechanism is the YORP effect.

    Physical characteristics

    The asteroid is characterized as both a carbonaceous C-type[12] and metallic M-type asteroid.[11]

    The density of the primary was calculated using the orbital elements of the binary system, the primary-to-secondary mass ratio, and estimates of the primary size. The primary has a low density of 1.7 g/cm3, which may indicate a "rubble pile" structure containing rocks and voids.

    Numbering and naming

    This minor planet was numbered by the Minor Planet Center on 20 May 2008.[17] As of 2018, it has not been named.[1]

    See also

    References

    1. 1 2 3 4 5 "185851 (2000 DP107)". Minor Planet Center. Retrieved 22 March 2017.
    2. 1 2 3 4 "JPL Small-Body Database Browser: 185851 (2000 DP107)" (2016-12-24 last obs.). Jet Propulsion Laboratory. Archived from the original on 23 March 2017. Retrieved 1 June 2017.
    3. 1 2 3 4 "LCDB Data for (185851)". Asteroid Lightcurve Database (LCDB). Retrieved 22 March 2017.
    4. 1 2 Naidu, S. P.; Margot, J. L.; Taylor, P. A.; Nolan, M. C.; Busch, M. W.; Benner, L. A. M.; et al. (August 2015). "Radar Imaging and Characterization of the Binary Near-Earth Asteroid (185851) 2000 DP107". The Astronomical Journal. 150 (2): 12. arXiv:1503.01743. Bibcode:2015AJ....150...54N. doi:10.1088/0004-6256/150/2/54. S2CID 85535751.
    5. 1 2 3 Marchis, F.; Enriquez, J. E.; Emery, J. P.; Mueller, M.; Baek, M.; Pollock, J.; et al. (November 2012). "Multiple asteroid systems: Dimensions and thermal properties from Spitzer Space Telescope and ground-based observations". Icarus. 221 (2): 1130–1161. arXiv:1604.05384. Bibcode:2012Icar..221.1130M. doi:10.1016/j.icarus.2012.09.013. S2CID 161887.
    6. 1 2 Polishook, David (July 2012). "Lightcurves and Spin Periods of Near-Earth Asteroids, The Wise Observatory, 2005 - 2010". The Minor Planet Bulletin. 39 (3): 187–192. Bibcode:2012MPBu...39..187P. ISSN 1052-8091.
    7. ↑ Skiff, Brian A.; Bowell, Edward; Koehn, Bruce W.; Sanborn, Jason J.; McLelland, Kyle P.; Warner, Brian D. (July 2012). "Lowell Observatory Near-Earth Asteroid Photometric Survey (NEAPS) - 2008 May through 2008 December". The Minor Planet Bulletin. 39 (3): 111–130. Bibcode:2012MPBu...39..111S. ISSN 1052-8091.
    8. ↑ Warner, Brian D.; Stephens, Robert D. (April 2009). "Lightcurve Analysis of Two Binary Asteroids: (76818) 2000 RG79 and (185851) 2000 DP107". The Minor Planet Bulletin. 36 (2): 62–63. Bibcode:2009MPBu...36...62W. ISSN 1052-8091.
    9. ↑ Pravec, P.; Kusnirak, P.; Hicks, M.; Holliday, B.; Warner, B. (October 2000). "2000 DP_107". IAU Circ. 7504 (7504): 3. Bibcode:2000IAUC.7504....3P.
    10. 1 2 Pravec, P.; Scheirich, P.; Kusnirák, P.; Sarounová, L.; Mottola, S.; Hahn, G.; et al. (March 2006). "Photometric survey of binary near-Earth asteroids". Icarus. 181 (1): 63–93. Bibcode:2006Icar..181...63P. doi:10.1016/j.icarus.2005.10.014.
    11. 1 2 Yang, B.; Zhu, J.; Gao, J.; Zhang, H. T.; Zheng, X. Z. (May 2003). "Observations of 2000 DP 107 in NAOC: rotation period and reflectance spectrum". Planetary and Space Science. 51 (6): 411–414. Bibcode:2003P&SS...51..411Y. doi:10.1016/S0032-0633(03)00024-2.
    12. 1 2 Dandy, C. L.; Fitzsimmons, A.; Collander-Brown, S. J. (June 2003). "Optical colors of 56 near-Earth objects: trends with size and orbit". Icarus. 163 (2): 363–373. Bibcode:2003Icar..163..363D. doi:10.1016/S0019-1035(03)00087-3.
    13. ↑ Pravec, Petr; Harris, Alan W.; Kusnirák, Peter; Galád, Adrián; Hornoch, Kamil (September 2012). "Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations". Icarus. 221 (1): 365–387. Bibcode:2012Icar..221..365P. doi:10.1016/j.icarus.2012.07.026.
    14. ↑ IAUC 7496: 2000 S1; 2000 DP107
    15. ↑ IAUC 7503: 2000dp; Sats of minor planets
    16. 1 2 Margot, J. L.; Nolan, M. C.; Benner, L. A. M.; Ostro, S. J.; Jurgens, R. F.; Giorgini, J. D.; et al. (May 2002). "Binary Asteroids in the Near-Earth Object Population". Science. 296 (5572): 1445–1448. Bibcode:2002Sci...296.1445M. doi:10.1126/science.1072094. PMID 11951001. S2CID 8768432.
    17. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 February 2018.
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