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Asteroids with Satellites Database--Johnston's Archive
(3390) Demanet
compiled by Wm. Robert Johnston
last updated30 April 2022--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: | 2.253140014 AU | | orbital periodP: | 3.382067496 yr
(= 1235.3234835 d) | | eccentricitye: | 0.114882312 | | perihelion distanceq: | 1.99429408 AU | | aphelion distanceQ: | 2.5119859484 AU | | inclinationi: | 3.3886456° | | argument of perihelionω: | 259.617379° | | ascending nodeΩ: | 342.81966° | | mean anomalyM: | 261.1106422° | | perihelion passageTP: | 2021 Nov 21.334294 | | Epoch: | 2020 Dec 17 | | data arc: | 1977-2021(3126 obs.) | | Earth MOID: | 0.983443 AU | | Jupiter Tisserand invariantTJ: | 3.614 |
orbital data, secondary: | semimajor axisas: | 14 km[*E] | | separation/primary radiusas/rp: | 5.7 [*E] | | separation/Hill radiusas/rH: | 0.018 [*E] | | orbital periodPs: | 1.5475± 0.0004d [B21b] | | eccentricityes: | ? | | normalized ang. mom.αL: | ? |
| other data, system (combined):| absolute mag.H: | 13.33[MPC] | | slope parameterG: | (0.15) [*A] | | effective diameterdE: | 5.06± 0.26 km [M11b] | | geometric albedo: | 0.274± 0.032[M11b] | | color indexU-B: | ? | | color indexB-V: | ? | | taxonomic type: | ? | | massm: | ? | | densityρ: | (1.6 g/cm3) [*A] | | Hill radiusrH: | 760 km [*E] |
other data, primary: | diameterdp: | 4.9± 0.25 km [*D] | | rotation periodRPp: | 2.59457± 0.00003h [B21b] | | amplitude in mag., rotationalΔM: | 0.18 [B21b] | | amplitude in mag., mutual eventsΔM: | 0.105 ±0.035 [B21b] | | pole directionΒ, λ: | ?,? |
other data, secondary: | diameterds: | 1.27± 0.12km [*D] | | diameter ratiods/dp: | 0.26± 0.02 [B21b] | | component mag. differenceΔM: | 2.93± 0.17 [*D] | | rotation periodRPs: | ? | |
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--(3390) Demanet --discovery and notes:
Primary discovered1984 Mar 02from La Silla, Chileby H. Debehogne.Alternate designation(s):1984 ES1, 1977 ED, 1978 QQ, 1982 UF11.Linked to prediscovery observations from 1977 Mar 09.Permanent number assigned 1986 Jan 26.
Named 1989 Dec 12 for the Demanet family name [MPC015573].
Companion discovered by Benishek, V. P. Pravec, and R. Durkeeusinglightcurve observations.Announced2021 Apr 24 [B21b].
--Links, more technical:
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--Links to ADS abstracts:
©2021, 2022by Wm. Robert Johnston.
Last modified30 April 2022.Return toHome. Return toAstronomy and Space. Return toAsteroids with Satellites.
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