Asteroids with Satellites Database--Johnston's Archive

(22899) Alconrad and S/2003 (22899) 1

compiled by Wm. Robert Johnston
last updated 21 June 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: 2.844299130 AU
orbital period P: 4.797015316 yr
(= 1752.109844 d)
eccentricity e: 0.081280706
perihelion distance q: 2.61311249 AU
aphelion distance Q: 3.075485771 AU
inclination i: 2.8811327°
argument of perihelion ω: 218.37885°
ascending node Ω: 136.02506°
mean anomaly M: 56.959018°
perihelion passage TP: 2013 Aug 18.7820
Epoch: 2014 May 23
data arc: 1994-2014 (934 obs.)
Earth MOID: 1.60724 AU
Jupiter Tisserand invariant TJ: 3.301

orbital data, secondary:
binary dynamical type:W [P07f]
semimajor axis as: 182 km [D10a]
separation/primary radius as/rp:66 [*E]
separation/Hill radius as/rH:0.161 [*E]
orbital period Ps: 56 d [M04a]
eccentricity es: ?
normalized ang. mom. αL: 0.76 [M09a]

other data, system (combined):
absolute mag. H: 13.7 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 5.68 ± 0.47 km [M11b]
geometric albedo: 0.181 ± 0.028 [M11b]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 1100 km [*E]

other data, primary:
diameter dp: 5.54 ± 0.46 km [*D]
rotation period RPp: 4.03 ± 0.03 h [P11b]
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 1.23 km [*D]
diameter ratio ds/dp: 0.222 [D10a]
component mag. difference ΔM: 2.5 [I8232]
rotation period RPs: ?

-- (22899) Alconrad and S/2003 (22899) 1 --discovery and notes:

Primary discovered 1999 Oct 11 from Višnjan, Croatia by K. Korlevic and M. Juric. Alternate designation(s): 1999 TO14, 1998 ML48. Linked to prediscovery observations from 1994 Oct 09. Permanent number assigned 2001 Mar 09.

Companion discovered 2003 Jul 26 by W. J. Merline, P. M. Tamblyn, C. R. Chapman, D. Nesvorny, D. D. Durda, C. Dumas, A. D. Storrs, L. M. Close, and F. Menard using Hubble Space Telescope observations from Hubble Space Telescope. Announced 2003 Oct 26 [M03j]. Provisional designation S/2003 (22899) 1.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2003-2014, 2016 by Wm. Robert Johnston.
Last modified 21 June 2016.
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