(25015)
Asteroids with Satellites Database--Johnston's Archive
(25015) Lairdclose
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:**2.2285435929 AUorbital period **P:**3.326838362 yr (= 1215.1506614 d)eccentricity **e:**0.197904727perihelion distance **q:**1.787504282 AUaphelion distance **Q:**2.6695829043 AUinclination **i:**5.7557088°argument of perihelion **ω:**41.408169°ascending node **Ω:**265.724839°mean anomaly **M:**91.790797°perihelion passage **TP:2018 Jun 21.167644Epoch:2019 Apr 27data arc:1968-2019 (1607 obs.)Earth MOID:**0.776501 AUJupiter Tisserand invariant **TJ:**3.611 orbital data, secondary: semimajor axis **as:**8.9 km [*E]separation/primary radius **as/rp:**6.7 [*E]separation/Hill radius **as/rH:**0.019 [*E]orbital period **Ps:**1.833 ± 0.0012 d [W19c]eccentricity es:?normalized ang. mom. αL:? | other data, system (combined): absolute mag. **H:**14.7 [MPC]slope parameter G: (0.15) [*A]effective diameter dE:2.90 ± 0.35 km [M11b]geometric albedo:0.365 ± 0.134 [M11b]color index U-B:?color index B-V:?taxonomic type:?mass m:?density ρ: (1.6 g/cm3) [*A]Hill radius **rH:**470 km [*E] other data, primary: diameter **dp:**2.64 ± 0.35 km [*D]rotation period **RPp:**4.4011 ± 0.0003 h [B18o]amplitude in mag., rotational **ΔM:**0.27 [B18o]amplitude in mag., mutual events **ΔM:**0.2 ±0.06 [B18o]pole direction Β, λ:? , ? other data, secondary: diameter **ds:**1.19 ± 0.18 km [*D]diameter ratio **ds/dp:**0.45 ± 0.04 [W19c]component mag. difference **ΔM:**1.7 ± 0.2 [*D]rotation period RPs:? |
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-- (25015) Lairdclose --discovery and notes:
Primary discovered 1998 Aug 19 from Haleakala, Hawaii, USA by JPL/GEODSS NEAT. Alternate designation(s): 1998 QN2, 1999 JL6. Linked to prediscovery observations from 1968 Jul 25. Permanent number assigned 2001 Jun 06.
Named 2019 Aug 27 for Laird M. Close (1967-) [MPC115894].
Companion discovered 2018 Aug 13 by V. Benishek, P. Pravec, J. Oey, R. Groom, D. Pray, and V. Chiorny using lightcurve observations from Sopot Observatory, Serbia; Blue Mountains Observatory; Darling range Observatory; Sugarloaf Mountain Observatory; Chuguev Station, Kharkiv Observatory, Ukraine. Announced 2018 Sep 14 [B18o].
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© 2018-2020, 2022 by Wm. Robert Johnston.
Last modified 30 April 2022.
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