Asteroids with Satellites Database--Johnston's Archive
(4272)
Entsuji
compiled by Wm. Robert Johnston
last updated
27 November 2015
--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: |
2.3680705319 AU
| |
orbital period P: |
3.644113963 yr
(= 1331.0377633 d)
| |
eccentricity e: |
0.249963265
| |
perihelion distance q: |
1.77613989 AU
| |
aphelion distance Q: |
2.960001175 AU
| |
inclination i: |
9.2769177°
| |
argument of perihelion ω: |
183.556037°
| |
ascending node Ω: |
184.434098°
| |
mean anomaly M: |
338.6854386°
| |
perihelion passage TP: |
2015 Sep 13.806906
| |
Epoch: |
2015 Jun 27
| |
data arc: |
1953-2015
(1296 obs.)
| |
Earth MOID: |
0.775272 AU
| |
Jupiter Tisserand invariant TJ: |
3.487
|
orbital data, secondary:
|
semimajor axis as: |
13
km
[*E]
| |
separation/primary radius as/rp: | 3.4 [*D] | |
separation/Hill radius as/rH: | 0.012 [*D] | |
orbital period Ps: |
0.6644
± 0.0003
d [B15d]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
12.8
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
7.68
± 0.17
km [M11b]
| |
geometric albedo: |
0.119
± 0.016
[M11b]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
S (SMASSII) [JPL]
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
1000 km [*E]
|
other data, primary:
|
diameter dp: |
7.56
km [*D]
| |
rotation period RPp: |
2.8087
± 0.0002
h [B15d]
| |
amplitude in mag., rotational ΔM: |
0.06
[B15d]
| |
amplitude in mag., mutual events ΔM: | 0.055 ±0.025 [B15d] | |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
1.36
km [*D]
| |
diameter ratio ds/dp: |
0.18
[B15d]
| |
component mag. difference ΔM: |
3.7
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(4272) Entsuji
--discovery and notes:
Primary discovered
1977 Mar 12
from
Kiso
by
Kosai and Hurukawa.
Alternate designation(s):
1977 EG5,
1953 VT, 1953 VV3, 1975 XD6, 1982 QN1.
Linked to prediscovery observations from 1953 Nov 03.
Permanent number assigned -.
Named -.
Companion discovered
2015 Sep 14
by V. Benishek, J. Pollock, D. Caton, R. Hawkins, P. Pravec, D. Pray, V. Chiorny, D. Reichart, J. Haislip, and A. Smith
using
lightcurve
observations from Belgrade Astronomical Observatory; Appalachian State University, USA; Ondrejov Observatory; Sugarloaf Mountain Observatory, South Deerfield, MA, USA; Kharkiv Observatory; University of North Carolina, Chapel Hill, NC, USA; Gemini North.
Announced
2015 Oct 30 [B15d].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2015
by Wm. Robert Johnston.
Last modified
27 November 2015.
Return to Home. Return to Astronomy and Space. Return to Asteroids with Satellites.