Asteroids with Satellites Database--Johnston's Archive

(1453) Fennia

compiled by Wm. Robert Johnston
last updated 21 September 2014

--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, Hungaria


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 1.896996724 AU
orbital period P: 2.612811469 yr
(= 954.3293890 d)
eccentricity e: 0.028285674
perihelion distance q: 1.843338894 AU
aphelion distance Q: 1.950654555 AU
inclination i: 23.6730487°
argument of perihelion ω: 255.07357°
ascending node Ω: 7.097722°
mean anomaly M: 339.90597°
perihelion passage TP: 2014 Jul 15.2675
Epoch: 2014 May 23
data arc: 1938-2014 (1037 obs.)
Earth MOID: 0.877773 AU
Jupiter Tisserand invariant TJ: 3.848


orbital data, secondary:
binary dynamical type:A [M09a]
semimajor axis as: 15 km [*E]
separation/primary radius as/rp:4.3 [*E]
separation/Hill radius as/rH:0.015 [*E]
orbital period Ps: 0.9579 ± 0.0004 d [W08a]
eccentricity es: ?
normalized ang. mom. αL: 0.66 [M09a]

other data, system (combined):
absolute mag. H: 12.5 [MPC]
slope parameter G: 0.32 [W08a]
effective diameter dE: 7.23 ± 0.4 km [T04c]
geometric albedo: 0.249 ± 0.032 [T04c]
color index U-B: 0.532 [JPL]
color index B-V: 0.928 [JPL]
color index V-R:0.48 ± 0.03 [W08a]
color index B-R:1.41 [*D]
color index V-I:0.97 [W08a]
taxonomic type: S (Tholen) [JPL]
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 1000 km [*E]

other data, primary:
diameter dp: 6.96 ± 0.39 km [*D]
rotation period RPp: 4.4121 ± 0.0001 h [W08a]
amplitude in mag., rotational ΔM: 0.10 ± 0.01 [W08a]
amplitude in mag., mutual events ΔM:0.08 [W08a]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 1.95 ± 0.18 km [*D]
diameter ratio ds/dp: >0.28 ± 0.02 [W08a]
component mag. difference ΔM: <2.8 ± 0.2 [*D]
rotation period RPs: ?

-- (1453) Fennia --discovery and notes:

Primary discovered 1938 Mar 08 from Turku, Finland by Y. Vaisala. Alternate designation(s): 1938 ED1 . Permanent number assigned -.

Named - for Finland [MPC3932].

Companion discovered 2007 Nov 04 by B. D. Warner, A. W. Harris, P. Pravec, R. D. Stephens, D. Pray, W. Cooney, J. Gross, D. Terrell, S. Gajdos, A. Galad, and Yu. Krugly using lightcurve observations from Palmer Divide Observatory, Colorado Springs, Colorado, USA; Space Science Institute; Ondrejov Observatory, Czech Republic; Goat Mountain Astronomical Research Station, Yucca Valley, California, USA; Carbuncle Hill Observatory, Greene, Rhode Island, USA; Sonoita Research Observatory, Sonoita, AZ; Modra Observatory, Slovakia; Main Astronomical Observatory, Kharkiv National University, Ukraine. Announced 2007 Dec 01 [W07b].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2007-2008, 2014 by Wm. Robert Johnston.
Last modified 21 September 2014.
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