Asteroids with Satellites Database--Johnston's Archive

(3905) Doppler

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: 2.559763440 AU
orbital period P: 4.095509619 yr
(= 1495.884888 d)
eccentricity e: 0.257997455
perihelion distance q: 1.89935099 AU
aphelion distance Q: 3.220175893 AU
inclination i: 14.1901105°
argument of perihelion ω: 91.024513°
ascending node Ω: 343.325937°
mean anomaly M: 31.080034°
perihelion passage TP: 2014 Jan 13.85513
Epoch: 2014 May 23
data arc: 1980-2014 (596 obs.)
Earth MOID: 0.974059 AU
Jupiter Tisserand invariant TJ: 3.347


orbital data, secondary:
semimajor axis as: 26 km [*E]
separation/primary radius as/rp:8.3 [*E]
separation/Hill radius as/rH:0.025 [*E]
orbital period Ps: 2.117 ± 0.004 d [H14a]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 12.5 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 7.91 ± 0.05 km [M11b]
geometric albedo: 0.236 ± 0.042 [M11b]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 1000 km [*E]

other data, primary:
diameter dp: 6.27 km [*D]
rotation period RPp: 50.8 ± 0.1 h [H14a]
amplitude in mag., rotational ΔM: 1.22 [F13b]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 4.83 km [*D]
diameter ratio ds/dp: >0.77 [F13b]
component mag. difference ΔM: <0.57 [*D]
rotation period RPs: ?

-- (3905) Doppler --discovery and notes:

Primary discovered 1984 Aug 28 from Klet, Czech Republic by A. Mrkos. Alternate designation(s): 1984 QO, 1980 RP2. Linked to prediscovery observations from 1980 Sep 08. Permanent number assigned 1988 Oct 25.

Named 1996 Aug 28 for Christian Doppler (1803-1853) [MPC27734].

Companion discovered 2013 Oct 20 using lightcurve observations. Announced 2013 Dec 16.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2014 by Wm. Robert Johnston.
Last modified 21 September 2014.
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