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Asteroids with Satellites Database--Johnston's Archive
(3912) Troja
compiled by Wm. Robert Johnston
last updated24 Oct 2021--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: | 2.3764377616 AU | | orbital periodP: | 3.663514116 yr
(= 1338.098531 d) | | eccentricitye: | 0.030612717 | | perihelion distanceq: | 2.303688546 AU | | aphelion distanceQ: | 2.4491869774 AU | | inclinationi: | 2.40189097° | | argument of perihelionω: | 59.864529° | | ascending nodeΩ: | 26.1369466° | | mean anomalyM: | 254.480629° | | perihelion passageTP: | 2022 Jul 28.20921 | | Epoch: | 2021 Jul 01 | | data arc: | 1937-2021(3052 obs.) | | Earth MOID: | 1.32072 AU | | Jupiter Tisserand invariantTJ: | 3.539 |
orbital data, secondary: | semimajor axisas: | 10 km[*E] | | separation/primary radiusas/rp: | 3.6 [*E] | | separation/Hill radiusas/rH: | 0.010 [*E] | | orbital periodPs: | 0.72379± 0.00012d [B21h] | | eccentricityes: | ? | | normalized ang. mom.αL: | ? |
| other data, system (combined):| absolute mag.H: | 13.21[MPC] | | slope parameterG: | (0.15) [*A] | | effective diameterdE: | 5.93± 0.16 km [M**] | | geometric albedo: | 0.328± 0.028[M**] | | color indexU-B: | ? | | color indexB-V: | ? | | taxonomic type: | ? | | massm: | ? | | densityρ: | (1.6 g/cm3) [*A] | | Hill radiusrH: | 1000 km [*E] |
other data, primary: | diameterdp: | 5.63± 0.15 km [*D] | | rotation periodRPp: | 3.65938± 0.00007h [B21h] | | amplitude in mag., rotationalΔM: | 0.18 [B21h] | | amplitude in mag., mutual eventsΔM: | 0.125 ±0.015 [B21h] | | pole directionΒ, λ: | ?,? |
other data, secondary: | diameterds: | 1.86± 0.12km [*D] | | axial ratiosa/b, b/c: | 1.4;? [B21h] | | diameter ratiods/dp: | 0.33± 0.02 [B21h] | | component mag. differenceΔM: | 2.41± 0.13 [*D] | | rotation periodRPs: | 17.371± 0.003h [B21h] | |
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--(3912) Troja --discovery and notes:
Primary discovered1988 Sep 16from Haute Provence, Franceby E. W. Elst.Alternate designation(s):1988 SG, 1937 VJ, 1970 SZ, 1970 WK, 1977 RE9, 1981 UC14, 1985 XD.Linked to prediscovery observations from 1937 Nov 07.Permanent number assigned 1988 Oct 25.
Named 1989 Feb 20 for the ancient Greek city [MPC014208].
Companion discovered2021 Sep 07 by V. Benishek, P. Pravec, and R. Durkeeusinglightcurve observations from Sopot Observatory, Serbia; Shed of Science South Observatory, Pontotoc, Texas, USA.Announced2021 Oct 22 [B21h].
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--Links to ADS abstracts:
©2021by Wm. Robert Johnston.
Last modified24 Oct 2021.Return toHome. Return toAstronomy and Space. Return toAsteroids with Satellites.
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