Asteroids with Satellites Database--Johnston's Archive
(21436)
Chaoyichi
compiled by Wm. Robert Johnston
last updated
29 May 2019
--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: |
2.186466611 AU
| |
orbital period P: |
3.233063798 yr
(= 1180.8988549 d)
| |
eccentricity e: |
0.085062306
| |
perihelion distance q: |
2.00048072 AU
| |
aphelion distance Q: |
2.372452503 AU
| |
inclination i: |
3.7371649°
| |
argument of perihelion ω: |
178.176309°
| |
ascending node Ω: |
320.375977°
| |
mean anomaly M: |
104.339255°
| |
perihelion passage TP: |
2013 Dec 31.7386
| |
Epoch: |
2014 Dec 09
| |
data arc: |
1989-2015
(883 obs.)
| |
Earth MOID: |
1.01415 AU
| |
Jupiter Tisserand invariant TJ: |
3.669
|
orbital data, secondary:
|
semimajor axis as: |
9.2
km
[*E]
| |
separation/primary radius as/rp: | 10 [*E] | |
separation/Hill radius as/rH: | 0.032 [*E] | |
orbital period Ps: |
3.382
± 0.0004
d [W17a]
| |
eccentricity es: |
0.1
[P15f]
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
15.3
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
1.95
± 0.26
km [M11b]
| |
geometric albedo: |
0.222
± 0.062
[M11b]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
290 km [*E]
|
other data, primary:
|
diameter dp: |
1.84
± 0.25
km []
| |
rotation period RPp: |
2.865
± 0
h [W17a]
| |
amplitude in mag., rotational ΔM: |
0.05
[lcdb]
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
0.64
± 0.09
| |
diameter ratio ds/dp: |
0.35
± 0.1
[P15f]
| |
component mag. difference ΔM: |
2.28
± 0.64
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(21436) Chaoyichi
--discovery and notes:
Primary discovered
1998 Mar 31
from
Socorro, New Mexico, USA
by
LINEAR Program.
Alternate designation(s):
1998 FL116,
1999 RP63.
Linked to prediscovery observations from 1989 Aug 30.
Permanent number assigned 2001 Feb 08.
Named 2006 Jul 11 for Chao Yi-Chi (1988-) [MPC057273].
Companion discovered
2014
by Pravec, P., P. Scheirich, P. Kusnirak, K. Hornoch, and A. Galad
using
lightcurve
observations.
Announced
2015 Aug 05 [P15f].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2015, 2019
by Wm. Robert Johnston.
Last modified
29 May 2019.
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