Asteroids with Satellites Database--Johnston's Archive
(23621)
1996 PA
compiled by Wm. Robert Johnston
last updated
8 October 2017
--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: |
1.9042605551 AU
| |
orbital period P: |
2.627783354 yr
(= 959.8159974 d)
| |
eccentricity e: |
0.298768422
| |
perihelion distance q: |
1.33532763 AU
| |
aphelion distance Q: |
2.4731934763 AU
| |
inclination i: |
19.3435237°
| |
argument of perihelion ω: |
153.352392°
| |
ascending node Ω: |
143.775049°
| |
mean anomaly M: |
20.54288°
| |
perihelion passage TP: |
2017 Jul 11.229487
| |
Epoch: |
2017 Sep 04
| |
data arc: |
1983-2017
(720 obs.)
| |
Earth MOID: |
0.340597 AU
| |
Jupiter Tisserand invariant TJ: |
3.822
|
orbital data, secondary:
|
semimajor axis as: |
5
km
[*E]
| |
separation/primary radius as/rp: | 4.2 [*E] | |
separation/Hill radius as/rH: | 0.020 [*E] | |
orbital period Ps: |
0.8583
± 0.0013
d [P17f]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
15.6
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
2.5
km [*E]
| |
geometric albedo: |
(0.16
) [*A]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
250 km [*E]
|
other data, primary:
|
diameter dp: |
2.4
km [*E]
| |
rotation period RPp: |
2.6649
± 0.0005
h [P17f]
| |
amplitude in mag., rotational ΔM: |
0.07
[P17f]
| |
amplitude in mag., mutual events ΔM: | 0.08 ±0.04 [P17f] | |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
0.65
km [*E]
| |
diameter ratio ds/dp: |
>0.27
[P17f]
| |
component mag. difference ΔM: |
2.8
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(23621) 1996 PA
--discovery and notes:
Primary discovered
1996 Aug 05
from
Siding Spring Observatory, New South Wales, Australia
by
G. J. Garradd.
Linked to prediscovery observations from 1983 Sep 14.
Companion discovered
2017 Jul 16
by D. Pray, J. Oey, P. Pravec, H. Kucakova, K. Hornoch, V. Benishek, A. Marchini, R. Papini, and F. Salvaggio
using
lightcurve
observations from Sugarloaf Mountain Observatory, South Deerfield, MA; Ondrejov Observatory; Blue Mountain Observatory; Sopot Observatory, Serbia; Astronomical Observatory of the University of Siena.
Announced
2017 Oct 04.
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2017
by Wm. Robert Johnston.
Last modified
8 October 2017.
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