Asteroids with Satellites Database--Johnston's Archive

(2535) Hameenlinna

compiled by Wm. Robert Johnston
last updated 6 March 2016

--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: 2.239903232 AU
orbital period P: 3.352307777 yr
(= 1224.453541 d)
eccentricity e: 0.079991841
perihelion distance q: 2.06072925 AU
aphelion distance Q: 2.4190772143 AU
inclination i: 3.4278763°
argument of perihelion ω: 309.239762°
ascending node Ω: 172.802065°
mean anomaly M: 8.492737°
perihelion passage TP: 2015 Dec 15.11400
Epoch: 2016 Jan 13
data arc: 1951-2016 (1845 obs.)
Earth MOID: 1.07829 AU
Jupiter Tisserand invariant TJ: 3.629


orbital data, secondary:
semimajor axis as: 19 km [*E]
separation/primary radius as/rp:4.1 [*E]
separation/Hill radius as/rH:0.013 [*E]
orbital period Ps: 0.8846 ± 0.0004 d [B16a]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 12.3 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 9.42 ± 0.07 km [M11b]
geometric albedo: 0.268 ± 0.03 [M11b]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 1500 km [*E]

other data, primary:
diameter dp: 9.2 km [*D]
rotation period RPp: 3.23106 ± 0.00006 h [B16a]
amplitude in mag., rotational ΔM: 0.1 [B16a]
amplitude in mag., mutual events ΔM:0.075 ±0.025 [B16a]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: >2.0 km [*D]
axial ratios a/b, b/c:1.5;? [B16a]
diameter ratio ds/dp: >0.22 [B16a]
component mag. difference ΔM: <3.3 [*D]
rotation period RPs: 21.23 ± 0.01 h [B16a]

-- (2535) Hameenlinna --discovery and notes:

Primary discovered 1939 Feb 17 from Turku, Finland by Y. Vaisala. Alternate designation(s): 1939 DH, 1929 EM, 1949 EF, 1954 UN, 1959 CB, 1964 TR, 1969 AZ, 1977 QQ4, 1981 VW, 1981 WV, 1981 YW1. Linked to prediscovery observations from 1929. Permanent number assigned 1982.

Named 1983 May 26 for the town in Hame, Finland [MPC7947].

Companion discovered 2015 Dec 18 by V. Benishek, D. Pray, P. Pravec, P. Kusnirak, K. Hornoch, H. Kucakova, J. Vrastil, J. Pollock, R. Groom, K. Stranger, A. Carbognani, R. Montaigut, A. Leroy, D. Reichart, J. Haislip using lightcurve observations from Sopot Observatory, Serbia; Sugarloaf Mountain Observatory, South Deerfield, Massachusetts, USA; Ondrejov Observatory, Czech Republic; Perth Observatory; Observatory of the Aosta Vally Autonomous Region, Italy; OPERA Observatory, France. Announced 2016 Feb 25 [B16a].

--Links, more technical:

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--Links to ADS abstracts:


© 2016 by Wm. Robert Johnston.
Last modified 6 March 2016.
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