Asteroids with Satellites Database--Johnston's Archive

(15700) 1987 QD

compiled by Wm. Robert Johnston
last updated 29 May 2019

--Orbital and physical data--

(See this page for definitions of quantities; source codes in brackets, see this link for full references; *A, *D, and *E indicate assumed, derived, and estimated values, respectively.)

dynamical type, primary: Mars crossing asteroid

orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 2.208448699 AU
orbital period P: 3.282004523 yr
(= 1198.752152 d)
eccentricity e: 0.315943606
perihelion distance q: 1.510703453 AU
aphelion distance Q: 2.906193944 AU
inclination i: 26.77721812°
argument of perihelion ω: 119.3688465°
ascending node Ω: 175.5081434°
mean anomaly M: 72.41362694°
perihelion passage TP: 2013 Sep 23.87224
Epoch: 2014 May 23
data arc: 1954-2013 (602 obs.)
Earth MOID: 0.619231 AU
Jupiter Tisserand invariant TJ: 3.46

orbital data, secondary:
semimajor axis as: 10 km [*E]
separation/primary radius as/rp:7.1 [*E]
separation/Hill radius as/rH:0.030 [*E]
orbital period Ps: 2.1 d [W17a]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 14.6 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 2.95 km [A17c]
geometric albedo: 0.268 [*A17]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 330 km [*E]

other data, primary:
diameter dp: 2.82 km [*D]
rotation period RPp: 3.0586 ± 0.0001 h [D10b]
amplitude in mag., rotational ΔM: 0.07 [D10b]
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 0.87 km [*D]
diameter ratio ds/dp: 0.31 ± 0.03 [W17a]
component mag. difference ΔM: 2.54 ± 0.21 [*D]
rotation period RPs: ?

-- (15700) 1987 QD --discovery and notes:

Primary discovered 1987 Aug 24 from Palomar Observatory, California, USA by S. Singer-Brewster. Alternate designation(s): 2000 JD1. Linked to prediscovery observations from 1954 May 27. Permanent number assigned 2000 Jul 26.

Companion discovered 2010 Sep 06 by R. Durkee, P. Pravec, K. Hornoch, P. Kusnirak, D. Pray, V. Chiorny, V. Shevchenko, J. Oey, N. Gaftonyuk, Yu. Krugly, D. Higgins, J. Vilagi, S. Gajdos, M. Husarik, M. Pikler, and J. G. Ries using lightcurve observations from Shed of Science Observatory, Minneapolis, Minnesota, USA; Ondrejov Observatory, Czech Republic; Carbuncle Hill Observatory, W. Brookfield, MA, USA; Kharkiv Observatory, Ukraine; Leura, New South Wales, Australia; Simeiz Observatory; Canberra, Australia; Modra Observatory, Slovakia; Skalnate Pleso Observatory; McDonald Observatory, Texas, USA. Announced 2010 Oct 06 [D10b].

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© 2010-2017, 2019 by Wm. Robert Johnston.
Last modified 29 May 2019.
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