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Asteroids with Satellites Database--Johnston's Archive
(16974) Iphthime
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:Jupiter trojan asteroid, L4
orbital data, primary (osculating elements)[JPL]: | semimajor axisa: | 5.19017267 AU | | orbital periodP: | 11.82422567 yr
(= 4318.879999 d) | | eccentricitye: | 0.070401721 | | perihelion distanceq: | 4.82477558 AU | | aphelion distanceQ: | 5.55556977 AU | | inclinationi: | 15.036372° | | argument of perihelionω: | 134.715771° | | ascending nodeΩ: | 241.559536° | | mean anomalyM: | 261.735542° | | perihelion passageTP: | 2021 Jun 13.86778 | | Epoch: | 2018 Mar 23 | | data arc: | 1974-2017(1073 obs.) | | Earth MOID: | 3.8459 AU | | Jupiter Tisserand invariantTJ: | 2.927 |
orbital data, secondary: | semimajor axisas: | 179± 10 km[*D] | | separation/primary radiusas/rp: | 7.9 [*D] | | separation/Hill radiusas/rH: | 0.0093 [*E] | | orbital periodPs: | 3.29d [*A] | | eccentricityes: | ? | | normalized ang. mom.αL: | ? |
| other data, system (combined):| absolute mag.H: | 9.8[MPC] | | slope parameterG: | (0.15) [*A] | | effective diameterdE: | 57.34± 0.33 km [G12d] | | geometric albedo: | 0.065± 0.010[G12d] | | color indexU-B: | ? | | color indexB-V: | ? | | taxonomic type: | ? | | massm: | ? | | densityρ: | (1.6 g/cm3) [*A] | | Hill radiusrH: | 19000 km [*E] |
other data, primary: | diameterdp: | 45.5± 3.3 km [*D] | | rotation periodRPp: | 78.9± 0.4h [M11e] | | amplitude in mag., rotationalΔM: | ? | | pole directionΒ, λ: | ?,? |
other data, secondary: | diameterds: | 34.9± 5.44km [*D] | | diameter ratiods/dp: | 0.767± 0.119 [*D] | | component mag. differenceΔM: | 0.6± 0.3 [*D] | | rotation periodRPs: | ? | |
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--(16974) Iphthime --discovery and notes:
Primary discovered1998 Nov 18from Socorro, New Mexico, USAby LINEAR Program.Alternate designation(s):1998 WR21, 1974 WX, 1986 WS.Linked to prediscovery observations from 1974 Nov 18.Permanent number assigned 2000 Sep 13.
Named 2017 Dec 03 for the mythological sister of Penelope [MPC107739].
Companion discovered2013 Mar 13usingHubble Space Telescope observations.Announced2016 Mar.
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©2018-2019, 2022by Wm. Robert Johnston.
Last modified30 April 2022.Return toHome. Return toAstronomy and Space. Return toAsteroids with Satellites.
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