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Asteroids with Satellites Database--Johnston's Archive

(4272) Entsuji

compiled by Wm. Robert Johnston
last updated27 November 2015

--Orbital and physical data--

(Seethis page for definitions of quantities; source codes in brackets, seethis 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 axisa:2.3680705319 AU
orbital periodP:3.644113963 yr
(= 1331.0377633 d)
eccentricitye:0.249963265
perihelion distanceq:1.77613989 AU
aphelion distanceQ:2.960001175 AU
inclinationi:9.2769177°
argument of perihelionω:183.556037°
ascending nodeΩ:184.434098°
mean anomalyM:338.6854386°
perihelion passageTP:2015 Sep 13.806906
Epoch:2015 Jun 27
data arc:1953-2015(1296 obs.)
Earth MOID:0.775272 AU
Jupiter Tisserand invariantTJ:3.487

orbital data, secondary:

semimajor axisas:13 km[*E]
separation/primary radiusas/rp:3.4 [*D]
separation/Hill radiusas/rH:0.012 [*D]
orbital periodPs:0.6644± 0.0003d [B15d]
eccentricityes:?
normalized ang. mom.αL:?
other data, system (combined):
absolute mag.H:12.8[MPC]
slope parameterG:(0.15) [*A]
effective diameterdE:7.68± 0.17 km [M11b]
geometric albedo:0.119± 0.016[M11b]
color indexU-B:?
color indexB-V:?
taxonomic type:S (SMASSII) [JPL]
massm:?
densityρ:(1.6 g/cm3) [*A]
Hill radiusrH:1000 km [*E]

other data, primary:

diameterdp:7.56 km [*D]
rotation periodRPp:2.8087± 0.0002h [B15d]
amplitude in mag., rotationalΔM:0.06 [B15d]
amplitude in mag., mutual eventsΔM:0.055 ±0.025 [B15d]
pole directionΒ, λ:?,?

other data, secondary:

diameterds:1.36km [*D]
diameter ratiods/dp:0.18 [B15d]
component mag. differenceΔM:3.7 [*D]
rotation periodRPs:?

--(4272) Entsuji --discovery and notes:

Primary discovered1977 Mar 12from Kisoby 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 discovered2015 Sep 14 by V. Benishek, J. Pollock, D. Caton, R. Hawkins, P. Pravec, D. Pray, V. Chiorny, D. Reichart, J. Haislip, and A. Smithusinglightcurve 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.Announced2015 Oct 30 [B15d].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


©2015by Wm. Robert Johnston.
Last modified27 November 2015.
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