Asteroids with Satellites Database--Johnston's Archive

(2171) Kiev

compiled by Wm. Robert Johnston
last updated 30 April 2022

--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: main belt asteroid

orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 2.2553847828 AU
orbital period P: 3.3871230074 yr
(= 1237.1700439 d)
eccentricity e: 0.16670166
perihelion distance q: 1.879408396 AU
aphelion distance Q: 2.6313611692 AU
inclination i: 7.5168189°
argument of perihelion ω: 180.259705°
ascending node Ω: 102.052214°
mean anomaly M: 329.756799°
perihelion passage TP: 2020 Sep 11.933285
Epoch: 2021 Jul 01
data arc: 1949-2020 (2639 obs.)
Earth MOID: 0.862939 AU
Jupiter Tisserand invariant TJ: 3.594

orbital data, secondary:
semimajor axis as: 17 km [*E]
separation/primary radius as/rp:4.35 [*E]
separation/Hill radius as/rH:0.015 [*E]
orbital period Ps: 0.9567 ± 0.0004 d [R20b]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 12.7 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 8.04 ± 0.15 km [M14c]
geometric albedo: 0.108 ± 0.009 [M14c]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 1100 km [*E]

other data, primary:
diameter dp: 7.82 km [*D]
rotation period RPp: 3.1716 ± 0.0002 h [R20b]
amplitude in mag., rotational ΔM: 0.11 [R20b]
amplitude in mag., mutual events ΔM:0.09 ±0.03 [R20b]
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: >1.88 km [*D]
axial ratios a/b, b/c:1.3;? []
diameter ratio ds/dp: >0.24 [R20b]
component mag. difference ΔM: <3.1 [*D]
rotation period RPs: 22.96 ± 0.01 h [R20b]

-- (2171) Kiev --discovery and notes:

Primary discovered 1973 Aug 28 from Nauchnyj, Crimea, Ukraine, USSR by T. Smirnova. Alternate designation(s): 1973 QD1, 1949 MN, 1949 MQ, 1956 RP, 1969 FK, 1970 XB. Linked to prediscovery observations from 1949 Jun 21. Permanent number assigned 1979.

Named 1982 Feb 08 for the city of Kiev, Ukraine [MPC006647].

Companion discovered 2020 Apr 15 by Romeuf, D., D. Augustin, R. Behrend, V. Benishek, P. Pravec, B. Christmann, J. Michelet, R. Montaigut, E. Barbotin, P. Sogorb, R. Durkee, F. Manzini, and F. Sold using lightcurve observations from Pommier Observatory, France; Deep Sky Chile Observatory, Chile; Sopot Observatory, Serbia; La Souchere Observatory, France; La Grande Vallee Observatory, France; Bastidan Observatory, France; Shed of Science South Observatory, Pontotoc, Texas, USA; Stazione Astronomica di Sozzago, Italy; Observatorio Amanecer de Arrakis, Sevilla, Spain. Announced 2020 Jun 10 [R20b].

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© 2020-2021, 2022 by Wm. Robert Johnston.
Last modified 30 April 2022.
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