Asteroids with Satellites Database--Johnston's Archive

(3187) Dalian

compiled by Wm. Robert Johnston
last updated 5 January 2023

--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: 2.2831827957 AU
orbital period P: 3.450001049 yr
(= 1260.1128833 d)
eccentricity e: 0.057610035
perihelion distance q: 2.151648555 AU
aphelion distance Q: 2.414717036 AU
inclination i: 2.7538326°
argument of perihelion ω: 105.004843°
ascending node Ω: 312.222738°
mean anomaly M: 21.174807°
perihelion passage TP: 2022 Dec 12.881537
Epoch: 2023 Feb 25
data arc: 1951-2022 (3223 obs.)
Earth MOID: 1.16388 AU
Jupiter Tisserand invariant TJ: 3.6

orbital data, secondary:
semimajor axis as: 11 km [*E]
separation/primary radius as/rp:3.7 [*E]
separation/Hill radius as/rH:0.011 [*E]
orbital period Ps: 0.7275 ± 0.0002 d [C23a]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 13.42 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 6.22 ± 0.07 km [M**]
geometric albedo: 0.262 ± 0.035 [M**]
color index U-B: ?
color index B-V: ?
taxonomic type: S (Tholen) [LMP]
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 1000 km [*E]

other data, primary:
diameter dp: 6.02 ± 0.07 km [*D]
rotation period RPp: 2.7086 ± 0.0001 h [C23a]
amplitude in mag., rotational ΔM: 0.1 [C23a]
amplitude in mag., mutual events ΔM:0.1 ±0.03 [C23a]
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: >1.57 ± 0.02 km [*D]
diameter ratio ds/dp: >0.26 [C23a]
component mag. difference ΔM: <2.9 [*D]
rotation period RPs: ?

-- (3187) Dalian --discovery and notes:

Primary discovered 1977 Oct 10 from Purple Mountain Observatory, Nanking, PR China by ?. Alternate designation(s): 1977 TO3, 1958 CB, 1977 UT1, 1982 AG, 1987 QR5. Linked to prediscovery observations from 1951 Feb 04. Permanent number assigned 1985 Feb 05.

Named 1993 Sep 01 [MPC022497].

Companion discovered 2022 Nov 20 by M. Conjat, D. Augustin, F. Manzini, R. Nicollerat, R. Roy, and R. Behrend using lightcurve observations from Nice Observatory, France; Deep Sky Chile Observatory, Pichasca, Chile; E-Eye Observatory, Spain; Stazione Astronomica di Sozzago, Italy; Valentines Observatory, Bex, Switzerland; Observatoire de Blauvac, France. Announced 2023 Jan 04 [C23a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2023 by Wm. Robert Johnston.
Last modified 5 January 2023.
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