Asteroids with Satellites Database--Johnston's Archive

(2516) Roman

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: 2.2791301927 AU
orbital period P: 3.4407546201 yr
(= 1256.7593604 d)
eccentricity e: 0.165174641
perihelion distance q: 1.902675681 AU
aphelion distance Q: 2.6555847047 AU
inclination i: 1.0934337°
argument of perihelion ω: 313.76614°
ascending node Ω: 123.39952°
mean anomaly M: 280.711635°
perihelion passage TP: 2020 Jan 28.795541
Epoch: 2019 Apr 27
data arc: 1964-2019 (2304 obs.)
Earth MOID: 0.918094 AU
Jupiter Tisserand invariant TJ: 3.588

orbital data, secondary:
semimajor axis as: 7.3 km [*E]
separation/primary radius as/rp:3.4 [*E]
separation/Hill radius as/rH:0.010 [*E]
orbital period Ps: 0.6758 ± 0.0002 d [B19g]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 13.5 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 4.41 ± 0.06 km [M11b]
geometric albedo: 0.301 ± 0.072 [M11b]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 770 km [*E]

other data, primary:
diameter dp: 4.3 ± 0.06 km [*D]
rotation period RPp: 2.6266 ± 0.0004 h [B19g]
amplitude in mag., rotational ΔM: 0.07 [B19g]
amplitude in mag., mutual events ΔM:0.085 ±0.025 [B19g]
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 0.99 ± 0.09 km [*D]
diameter ratio ds/dp: 0.23 ± 0.02 [B19g]
component mag. difference ΔM: 3.2 ± 0.2 [*D]
rotation period RPs: ?

-- (2516) Roman --discovery and notes:

Primary discovered 1964 Nov 06 from Goethe Link Observatory, Brooklyn, Indiana, USA by Indiana Asteroid Program. Alternate designation(s): 1964 VY, 1964 VG2, 1974 SH, 1976 GB6. Permanent number assigned -.

Named 1985 Dec 27 for Nancy Grace Roman (1925-2018) [MPC010311].

Companion discovered 2019 Oct 22 by V. Benishek, P. Pravec, R. Durkee, M. Husarik, M. Pilker, G. Cervak, F. Pilcher, V. Chiorny, and O. Leura using lightcurve observations from Sopot Observatory, Serbia; Shed of Science South Observatory, Pontotoc, Texas, USA; Skalnate Pleso Observatory; Organ Mesa Observatory, Las Cruces, New Mexico, USA; Chuguev station, Kharkiv Observatory, Ukraine; blue Mountains Observatory, Leura, New South Wales, Australia. Announced 2019 Dec 13 [B19g].

--Links, more technical:

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--Links to ADS abstracts:

© 2019, 2022 by Wm. Robert Johnston.
Last modified 30 April 2022.
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