(185851) 2000 DP107

(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.

(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]

    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. "185851 (2000 DP107)". Minor Planet Center. Retrieved 22 March 2017.
    2. "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. "LCDB Data for (185851)". Asteroid Lightcurve Database (LCDB). Retrieved 22 March 2017.
    4. 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. 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. 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. 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. 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. 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. 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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