Asteroids with Satellites Database--Johnston's Archive
(3873)
Roddy
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:
Mars crossing asteroid
orbital data, primary (osculating elements)
[JPL]
: |
semimajor axis a: |
1.892048452 AU
| |
orbital period P: |
2.602594950 yr
(= 950.5978056 d)
| |
eccentricity e: |
0.133696579
| |
perihelion distance q: |
1.63908805 AU
| |
aphelion distance Q: |
2.145008858 AU
| |
inclination i: |
23.3549639°
| |
argument of perihelion ω: |
267.548484°
| |
ascending node Ω: |
250.077283°
| |
mean anomaly M: |
46.394575°
| |
perihelion passage TP: |
2014 Jan 20.49282
| |
Epoch: |
2014 May 23
| |
data arc: |
1953-2014
(1037 obs.)
| |
Earth MOID: |
0.787255 AU
| |
Jupiter Tisserand invariant TJ: |
3.847
|
orbital data, secondary:
|
semimajor axis as: |
14
km
[*E]
| |
separation/primary radius as/rp: | 3.9 [*E] | |
separation/Hill radius as/rH: | 0.015 [*E] | |
orbital period Ps: |
0.8017
± 0.0008
d [W12a]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
12.7
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
7.51
± 0.25
km [U11a]
| |
geometric albedo: |
0.512
± 0.039
[U11a]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
S (SMASSII) [JPL]
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
930 km [*E]
|
other data, primary:
|
diameter dp: |
7.25
± 0.24
km [*D]
| |
rotation period RPp: |
2.47900
± 0.00006
h [W13b]
| |
amplitude in mag., rotational ΔM: |
0.11
[W13b]
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
1.96
± 0.16
km [*D]
| |
diameter ratio ds/dp: |
0.27
± 0.02
[W12a]
| |
component mag. difference ΔM: |
2.8
± 0.2
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(3873) Roddy
--discovery and notes:
Primary discovered
1984 Nov 21
from
Palomar Observatory, California, USA
by
C. S. Shoemaker.
Alternate designation(s):
1984 WB,
1953 XK1.
Linked to prediscovery observations from 1953 Dec 07.
Permanent number assigned 1988 Aug 27.
Named 1989 Dec 12 for David J. Roddy [MPC15574].
Companion discovered
2012 Aug 13
by B. D. Warner
using
lightcurve
observations from Palmer Divide Observatory, Colorado Springs, Colorado, USA.
Announced
2013 Jan [W13b].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Warner, Brian D. 2013, Minor Planet Bulletin Rounding Up the Unusual Suspects
- Warner, Brian D. 2011, Minor Planet Bulletin Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2010 September-December
- Warner, Brian D. 2009, Minor Planet Bulletin Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2009 March-June
- Warner, Brian D. 2008, Minor Planet Bulletin Asteroid Lightcurve Analysis at the Palmer Divide Observatory - June - October 2007
- Warner, Brian D. 2006, Minor Planet Bulletin Asteroid lightcurve analysis at the Palmer Divide Observatory - late 2005 and early 2006
- Bus, S. & Binzel, R. P. 2004, NASA Planetary Data System 3873 Roddy CCD Spectrum
©
2013, 2014
by Wm. Robert Johnston.
Last modified
21 September 2014.
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