Asteroids with Satellites Database--Johnston's Archive
(2871)
Schober
compiled by Wm. Robert Johnston
last updated
4 February 2023
--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: |
2.2577682604 AU
| |
orbital period P: |
3.392557736 yr
(= 1239.1317132 d)
| |
eccentricity e: |
0.139351478
| |
perihelion distance q: |
1.943144916 AU
| |
aphelion distance Q: |
2.5723916051 AU
| |
inclination i: |
5.77113132°
| |
argument of perihelion ω: |
335.2480263°
| |
ascending node Ω: |
28.317743°
| |
mean anomaly M: |
62.7463194°
| |
perihelion passage TP: |
2022 Jul 24.025127
| |
Epoch: |
2023 Feb 25
| |
data arc: |
1954-2022
(3403 obs.)
| |
Earth MOID: |
0.941273 AU
| |
Jupiter Tisserand invariant TJ: |
3.603
|
orbital data, secondary:
|
semimajor axis as: |
21
km
[*E]
| |
separation/primary radius as/rp: | 6.4 [*E] | |
separation/Hill radius as/rH: | 0.021 [*E] | |
orbital period Ps: |
1.7696
± 0.0008
d [B23c]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
12.85
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
6.8
± 0.16
km [M**]
| |
geometric albedo: |
0.264
± 0.021
[M**]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
color index J-H: | 0.513 ± 0.042 [LMP] | |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
1000 km [*E]
|
other data, primary:
|
diameter dp: |
6.55
± 0.15
km [*D]
| |
rotation period RPp: |
2.85219
± 0.00009
h [B23c]
| |
amplitude in mag., rotational ΔM: |
0.17
[B23c]
| |
amplitude in mag., mutual events ΔM: | 0.08 [B23c] | |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
>1.83
km [*D]
| |
diameter ratio ds/dp: |
>0.28
[B23c]
| |
component mag. difference ΔM: |
<2.8
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(2871) Schober
--discovery and notes:
Primary discovered
1981 Aug 30
from
Flagstaff, Arizona, USA
by
E. Bowell.
Alternate designation(s):
1981 QC2,
1954 UD2, 1961 XS, 1971 SD2, 1971 TB3.
Linked to prediscovery observations from 1954 Oct 25.
Permanent number assigned 1983 Apr 27.
Named 1985 Jul 02 [MPC009769].
Companion discovered
2022 Oct 18
by V. Benishek, P. Pravec, and F. Pilcher
using
lightcurve
observations from Sopot Observatory, Serbia; Organ Mesa Observatory, New Mexico, USA.
Announced
2023 Feb 03 [B23c].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2023
by Wm. Robert Johnston.
Last modified
4 February 2023.
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