(2860)

Pasacentennium (original) (raw)

Asteroids with Satellites Database--Johnston's Archive

(2860) Pasacentennium

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:**2.3325666976 AUorbital period **P:**3.562536385 yr (= 1301.2164145 d)eccentricity **e:**0.2149031perihelion distance **q:**1.831290882 AUaphelion distance **Q:**2.833842513 AUinclination **i:**22.6912709°argument of perihelion **ω:**70.7306914°ascending node **Ω:**334.4580233°mean anomaly **M:**40.2087208°perihelion passage **TP:2021 Aug 28.665979Epoch:2022 Jan 21data arc:1978-2022 (2436 obs.)Earth MOID:**0.943292 AUJupiter Tisserand invariant **TJ:**3.437 orbital data, secondary: semimajor axis **as:**41 km [*E]separation/primary radius **as/rp:**13 [*E]separation/Hill radius **as/rH:**0.045 [*E]orbital period **Ps:**4.99 ± 0.01 d [B22c]eccentricity es:?normalized ang. mom. αL:?

other data, system (combined): absolute mag. **H:**12.75 [MPC]slope parameter G: (0.21) [*A]effective diameter dE:6.77 ± 0.22 km [M12b]geometric albedo:0.352 ± 0.043 [M12b]color index U-B:?color index B-V:?taxonomic type:?mass m:?density ρ: (1.6 g/cm3) [*A]Hill radius **rH:**910 km [*E] other data, primary: diameter **dp:**6.24 ± 0.20 km [*D]rotation period **RPp:**2.6609 ± 0.0001 h [B22c]amplitude in mag., rotational **ΔM:**0.17 [B22c]amplitude in mag., mutual events **ΔM:**0.18 [B22c]pole direction Β, λ:? , ? other data, secondary: diameter **ds:**2.62 ± 0.15 km [*D]diameter ratio **ds/dp:**0.42 ± 0.02 [B22c]component mag. difference **ΔM:**1.88 ± 0.10 [*D]rotation period RPs:?

-- (2860) Pasacentennium --discovery and notes:

Primary discovered 1978 Oct 08 from Palomar Observatory, California, USA by E. F. Helin. Alternate designation(s): 1978 TA. Linked to prediscovery observations from 1978 Sep 23. Permanent number assigned 1983 Mar 28.

Named 1986 Mar 26 for the centennial of the city of Pasadena, California, USA [MPC010546].

Companion discovered 2021 Nov 16 by V. Benishek, P. Pravec, H. Kucackova, K. Hornoch, P. Kusnirak, B. Warner, P. Sogorb, P. Bacci, M. Maestripieri, R. Montaigut, and A. Leroy using lightcurve observations from Sopot Observatory, Serbia; Ondrejov Observatory, Czech Republic; Center for Solar System Studies, Eaton, Colorado, USA; Bastidan Observatory, France; San Marcello Pistoiese Observatory; OPERA Observatory, France. Announced 2022 Apr 21 [B22c].

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© 2022 by Wm. Robert Johnston.
Last modified 30 April 2022.
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