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Asteroids with Satellites Database--Johnston's Archive
(163693) Atira
compiled by Wm. Robert Johnston
last updated19 February 2017--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:NEA, Atira
orbital data, primary (osculating elements)[JPL]: | semimajor axisa: | 0.7410827428 AU | | orbital periodP: | 0.637969697 yr
(= 233.0228326 d) | | eccentricitye: | 0.32216064 | | perihelion distanceq: | 0.502335056 AU | | aphelion distanceQ: | 0.97983043 AU | | inclinationi: | 25.617734° | | argument of perihelionω: | 252.931962° | | ascending nodeΩ: | 103.907079° | | mean anomalyM: | 132.78882° | | perihelion passageTP: | 2016 Nov 22.047703 | | Epoch: | 2017 Feb 16 | | data arc: | 2003-2015(376 obs.) | | Earth MOID: | 0.206966 AU | | Jupiter Tisserand invariantTJ: | 7.666 |
orbital data, secondary: | semimajor axisas: | 6 km (separation) [R17a] | | separation/primary radiusas/rp: | 2.5 [*D] | | separation/Hill radiusas/rH: | 0.032 [*D] | | orbital periodPs: | 0.646d [R17a] | | eccentricityes: | ? | | normalized ang. mom.αL: | ? |
| other data, system (combined):| absolute mag.H: | 16.3[MPC] | | slope parameterG: | (0.15) [*A] | | effective diameterdE: | 4.9± 0.5 km [*D] | | geometric albedo: | 0.022[*D] | | color indexU-B: | ? | | color indexB-V: | ? | | taxonomic type: | ? | | massm: | ? | | densityρ: | (1.6 g/cm3) [*A] | | Hill radiusrH: | 190 km [*E] |
other data, primary: | diameterdp: | 4.8± 0.5 km [R17a] | | rotation periodRPp: | 2.9745h [JPL] | | amplitude in mag., rotationalΔM: | ? | | pole directionΒ, λ: | ?,? |
other data, secondary: | diameterds: | 1± 0.3km [R17a] | | diameter ratiods/dp: | 0.21± 0.07 [*D] | | component mag. differenceΔM: | 3.4± 0.7 [*D] | | rotation periodRPs: | ? | |
|
--(163693) Atira --discovery and notes:
Primary discovered2003 Feb 11from Socorro, New Mexico, USAby LINEAR Program.Alternate designation(s):2003 CP20.Permanent number assigned 2007 Sep 26.
Named 2008 Jan 22 for the mythological Pawnee goddess of Earth [MPC61768].
Companion discovered2017 Jan 20 by E. G. Rivera-Valentin, P. A. Taylor, A. Virkki, and B. Aponte-Hernandezusingradar observations from Arecibo Observatory, Puerto Rico.Announced2017 Jan 28 [R17a].
--Links, more technical:
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--Links to ADS abstracts:
©2017by Wm. Robert Johnston.
Last modified19 February 2017.Return toHome. Return toAstronomy and Space. Return toAsteroids with Satellites.
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