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 AU
orbital period P: 3.562536385 yr
(= 1301.2164145 d)
eccentricity e: 0.2149031
perihelion distance q: 1.831290882 AU
aphelion distance Q: 2.833842513 AU
inclination i: 22.6912709°
argument of perihelion ω: 70.7306914°
ascending node Ω: 334.4580233°
mean anomaly M: 40.2087208°
perihelion passage TP: 2021 Aug 28.665979
Epoch: 2022 Jan 21
data arc: 1978-2022 (2436 obs.)
Earth MOID: 0.943292 AU
Jupiter 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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--Links to ADS abstracts:


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