Asteroids with Satellites Database--Johnston's Archive

(1313) Berna

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

orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 2.655728252 AU
orbital period P: 4.327964130 yr
(= 1580.788899 d)
eccentricity e: 0.208458632
perihelion distance q: 2.10211877 AU
aphelion distance Q: 3.209337729 AU
inclination i: 12.5347978°
argument of perihelion ω: 99.290186°
ascending node Ω: 298.356889°
mean anomaly M: 192.381733°
perihelion passage TP: 2016 May 28.02526
Epoch: 2014 May 23
data arc: 1933-2014 (1198 obs.)
Earth MOID: 1.15153 AU
Jupiter Tisserand invariant TJ: 3.323

orbital data, secondary:
binary dynamical type:B [P07f]
semimajor axis as: 25 km [*E]
separation/primary radius as/rp:2.23 [B06a]
separation/Hill radius as/rH:0.014 [*D]
orbital period Ps: 1.061 ± 0.00004 d [B06a]
eccentricity es: ?
normalized ang. mom. αL: 1.45 [P07f]

other data, system (combined):
absolute mag. H: 11.6 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 13.5 ± 0.31 km [M11b]
geometric albedo: 0.184 ± 0.02 [M11b]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: 1.14x1015 kg [*D]
density ρ: 1.22 ± 0.15 g/cm3[B06a]
Hill radius rH: 1800 km [*D]

other data, primary:
diameter dp: 10.6 ± 0.24 km [*D]
rotation period RPp: 25.464 ± 0.001 h [B06a]
amplitude in mag., rotational ΔM: 0.28 ± 0.02 [B06a]
amplitude in mag., mutual events ΔM:0.75 ±0.05 [B06a]
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 8.37 km [*D]
diameter ratio ds/dp: 0.79 [B06a]
component mag. difference ΔM: 0.51 [*D]
rotation period RPs: ?

-- (1313) Berna --discovery and notes:

Primary discovered 1933 Aug 24 from Uccle, Belgium by S. J. Arend. Alternate designation(s): 1933 QG, 1926 EA, A911 OA. Permanent number assigned -.

Named - for the city of Berne, Switzerland.

Companion discovered 2004 Feb 06 by R. Behrend, R. Roy, S. Sposetti, N. Waelchli, D. Pray, N. Berger, C. Demeautis, D. Matter, R. Durkee, A. Klotz, D. Starkey, and V. Cotrez using lightcurve observations from Geneva Observatory. Announced 2004 Feb 23 [B04c].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2004-2006, 2014 by Wm. Robert Johnston.
Last modified 21 September 2014.
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