Asteroids with Satellites Database--Johnston's Archive
(25015)
Lairdclose
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: |
2.2285435929 AU
| |
orbital period P: |
3.326838362 yr
(= 1215.1506614 d)
| |
eccentricity e: |
0.197904727
| |
perihelion distance q: |
1.787504282 AU
| |
aphelion distance Q: |
2.6695829043 AU
| |
inclination i: |
5.7557088°
| |
argument of perihelion ω: |
41.408169°
| |
ascending node Ω: |
265.724839°
| |
mean anomaly M: |
91.790797°
| |
perihelion passage TP: |
2018 Jun 21.167644
| |
Epoch: |
2019 Apr 27
| |
data arc: |
1968-2019
(1607 obs.)
| |
Earth MOID: |
0.776501 AU
| |
Jupiter Tisserand invariant TJ: |
3.611
|
orbital data, secondary:
|
semimajor axis as: |
8.9
km
[*E]
| |
separation/primary radius as/rp: | 6.7 [*E] | |
separation/Hill radius as/rH: | 0.019 [*E] | |
orbital period Ps: |
1.833
± 0.0012
d [W19c]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
14.7
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
2.90
± 0.35
km [M11b]
| |
geometric albedo: |
0.365
± 0.134
[M11b]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
470 km [*E]
|
other data, primary:
|
diameter dp: |
2.64
± 0.35
km [*D]
| |
rotation period RPp: |
4.4011
± 0.0003
h [B18o]
| |
amplitude in mag., rotational ΔM: |
0.27
[B18o]
| |
amplitude in mag., mutual events ΔM: | 0.2 ±0.06 [B18o] | |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
1.19
± 0.18
km [*D]
| |
diameter ratio ds/dp: |
0.45
± 0.04
[W19c]
| |
component mag. difference ΔM: |
1.7
± 0.2
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(25015) Lairdclose
--discovery and notes:
Primary discovered
1998 Aug 19
from
Haleakala, Hawaii, USA
by
JPL/GEODSS NEAT.
Alternate designation(s):
1998 QN2,
1999 JL6.
Linked to prediscovery observations from 1968 Jul 25.
Permanent number assigned 2001 Jun 06.
Named 2019 Aug 27 for Laird M. Close (1967-) [MPC115894].
Companion discovered
2018 Aug 13
by V. Benishek, P. Pravec, J. Oey, R. Groom, D. Pray, and V. Chiorny
using
lightcurve
observations from Sopot Observatory, Serbia; Blue Mountains Observatory; Darling range Observatory; Sugarloaf Mountain Observatory; Chuguev Station, Kharkiv Observatory, Ukraine.
Announced
2018 Sep 14 [B18o].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2018-2020, 2022
by Wm. Robert Johnston.
Last modified
30 April 2022.
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