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:

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--Links to ADS abstracts:

© 2015 by Wm. Robert Johnston.
Last modified 27 November 2015.
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