Asteroids with Satellites Database--Johnston's Archive
(21527)
Horton
compiled by Wm. Robert Johnston
last updated
30 April 2022
--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: |
2.578635661 AU
| |
orbital period P: |
4.1408068835 yr
(= 1512.458279 d)
| |
eccentricity e: |
0.183169195
| |
perihelion distance q: |
2.10630904 AU
| |
aphelion distance Q: |
3.05096228 AU
| |
inclination i: |
12.6945139°
| |
argument of perihelion ω: |
47.288121°
| |
ascending node Ω: |
286.407008°
| |
mean anomaly M: |
335.386683°
| |
perihelion passage TP: |
2019 Aug 08.407266
| |
Epoch: |
2019 Apr 27
| |
data arc: |
1951-2019
(1511 obs.)
| |
Earth MOID: |
1.11539 AU
| |
Jupiter Tisserand invariant TJ: |
3.368
|
orbital data, secondary:
|
semimajor axis as: |
8.7
km
[*E]
| |
separation/primary radius as/rp: | 3.6 [*E] | |
separation/Hill radius as/rH: | 0.011 [*E] | |
orbital period Ps: |
0.7267
± 0.0004
d [B19e]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
13.3
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
4.99
± 0.35
km [M11b]
| |
geometric albedo: |
0.340
± 0.064
[M11b]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
800 km [*E]
|
other data, primary:
|
diameter dp: |
4.88
km [*D]
| |
rotation period RPp: |
2.76762
± 0.00011
h [B19e]
| |
amplitude in mag., rotational ΔM: |
0.08
[B19e]
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
>1.02
km [*D]
| |
diameter ratio ds/dp: |
>0.21
[B19e]
| |
component mag. difference ΔM: |
<3.4
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(21527) Horton
--discovery and notes:
Primary discovered
1998 Jun 24
from
Socorro, New Mexico, USA
by
LINEAR Program.
Alternate designation(s):
1998 MV27,
1999 XY191.
Linked to prediscovery observations from 1951 Jan 04.
Permanent number assigned 2001 Feb 08.
Named 2006 Jul 11 for Douglas Ray Horton (1988-) [MPC057275].
Companion discovered
2019 Sep 04
by V. Benishek, P. Pravec, P. Kusnirak, V. Chiorny, D. Pray
using
lightcurve
observations from Sopot Observatory, Serbia; Chuguev station, Kharkiv Observatory, Ukraine; Sugarload Mountain Observatory.
Announced
2019 Oct 18 [B19e].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2019, 2022
by Wm. Robert Johnston.
Last modified
30 April 2022.
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