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Asteroids with Satellites Database--Johnston's Archive
(450894) 2008 BT18
compiled by Wm. Robert Johnston
last updated18 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, Apollo(PHA)
orbital data, primary (osculating elements)[JPL]: | semimajor axisa: | 2.222999067 AU | | orbital periodP: | 3.314493129 yr
(= 1210.618615 d) | | eccentricitye: | 0.593195991 | | perihelion distanceq: | 0.904324933 AU | | aphelion distanceQ: | 3.541673202 AU | | inclinationi: | 8.1317743° | | argument of perihelionω: | 139.247696° | | ascending nodeΩ: | 107.690055° | | mean anomalyM: | 287.475271° | | perihelion passageTP: | 2015 Jan 21.88829 | | Epoch: | 2014 May 23 | | data arc: | 1955-2008(253 obs.) | | Earth MOID: | 0.0104424 AU | | Jupiter Tisserand invariantTJ: | 3.383 |
orbital data, secondary: | semimajor axisas: | 1.5 km (separation) [B08c] | | separation/primary radiusas/rp: | 5.0 [*E] | | separation/Hill radiusas/rH: | 0.035 [*E] | | orbital periodPs: | 1.2d [*E] | | eccentricityes: | ? | | normalized ang. mom.αL: | ? |
| other data, system (combined):| absolute mag.H: | 18.3[MPC]
18.2 ± 0.2 [B09a] | | slope parameterG: | 0.20 [B09a] | | effective diameterdE: | 0.63 km [*D] | | geometric albedo: | 0.21[*E] | | color indexU-B: | ? | | color indexB-V: | ? | | taxonomic type: | ? | | massm: | ? | | densityρ: | (1.6 g/cm3) [*A] | | Hill radiusrH: | 43 km [*E] |
other data, primary: | diameterdp: | 0.6 km [B08c] | | rotation periodRPp: | 2.726± 0.007h [B09a] | | amplitude in mag., rotationalΔM: | 0.045± 0.002 [B09a] | | pole directionΒ, λ: | ?,? |
other data, secondary: | diameterds: | >0.2km [B08c] | | diameter ratiods/dp: | 0.333 [*D] | | component mag. differenceΔM: | 2.4 [* D] | | rotation periodRPs: | ? | |
|
--(450894) 2008 BT18 --discovery and notes:
Primary discovered2008 Jan 31from Lincoln Laboratory ETS, New Mexico, USAby LINEAR.Linked to prediscovery observations from 1955 Mar 14.
Companion discovered2008 Jul 06 by L. A. M. Benner, M. C. Nolan, E. S. Howell, C. Magri, J. D. Giorgini, S. J. Ostro, M. Brozovic, M. W. Busch, J. L. Margot, P. A. Taylor, M. K. Shepard, L. M. Carter, and T. M. Beckerusingradar observations from Arecibo Observatory, Puerto Rico.Announced2008 Jul 29 [B08c].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Betzler, Alberto Silva & Novaes, Alberto Brum 2009, Minor Planet BulletinObservations of V-type Binary Near-Earth Asteroids 2006 VV2 and 2008 BT18
- Reddy, Vishnu, Emery, J. P., & Gaffey, M. J. 2008, Bulletin of the American Astronomical SocietyCompositional Investigation of Binary Potentially-Hazardous Asteroid 2008 BT<SUB>18</SUB>: A Basaltic Achondrite
- Benner, L. A. M., Nolan, M. C., Howell, E. S., Magri, C., Giorgini, J. D., Ostro, S. J., Brozovic, M., Busch, M. W., Margot, J. L., Taylor, P. A., Shepard, M. K., Carter, L. M., & Becker, T. M. 2008, Central Bureau Electronic Telegrams2008 BT_18
©2008-2014, 2017by Wm. Robert Johnston.
Last modified18 February 2017.Return toHome. Return toAstronomy and Space. Return toAsteroids with Satellites.
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