Asteroids with Satellites Database--Johnston's Archive
(450894) 2008 BT18
compiled by Wm. Robert Johnston
last updated
18 February 2017
--Orbital and physical data--
(See this page for definitions of quantities; source codes in brackets, see this 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 axis a: |
2.222999067 AU
| |
orbital period P: |
3.314493129 yr
(= 1210.618615 d)
| |
eccentricity e: |
0.593195991
| |
perihelion distance q: |
0.904324933 AU
| |
aphelion distance Q: |
3.541673202 AU
| |
inclination i: |
8.1317743°
| |
argument of perihelion ω: |
139.247696°
| |
ascending node Ω: |
107.690055°
| |
mean anomaly M: |
287.475271°
| |
perihelion passage TP: |
2015 Jan 21.88829
| |
Epoch: |
2014 May 23
| |
data arc: |
1955-2008
(253 obs.)
| |
Earth MOID: |
0.0104424 AU
| |
Jupiter Tisserand invariant TJ: |
3.383
|
orbital data, secondary:
|
semimajor axis as: |
1.5
km
(separation)
[B08c]
| |
separation/primary radius as/rp: | 5.0 [*E] | |
separation/Hill radius as/rH: | 0.035 [*E] | |
orbital period Ps: |
1.2
d [*E]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
18.3
[MPC]
18.2 ± 0.2 [B09a]
| |
slope parameter G: |
0.20 [B09a]
| |
effective diameter dE: |
0.63
km [*D]
| |
geometric albedo: |
0.21
[*E]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
43 km [*E]
|
other data, primary:
|
diameter dp: |
0.6
km [B08c]
| |
rotation period RPp: |
2.726
± 0.007
h [B09a]
| |
amplitude in mag., rotational ΔM: |
0.045
± 0.002
[B09a]
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
>0.2
km [B08c]
| |
diameter ratio ds/dp: |
0.333
[*D]
| |
component mag. difference ΔM: |
2.4
[* D]
| |
rotation period RPs: |
?
| |
|
|
--
(450894) 2008 BT18
--discovery and notes:
Primary discovered
2008 Jan 31
from
Lincoln Laboratory ETS, New Mexico, USA
by
LINEAR.
Linked to prediscovery observations from 1955 Mar 14.
Companion discovered
2008 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. Becker
using
radar
observations from Arecibo Observatory, Puerto Rico.
Announced
2008 Jul 29 [B08c].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Betzler, Alberto Silva & Novaes, Alberto Brum 2009, Minor Planet Bulletin Observations 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 Society Compositional 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 Telegrams 2008 BT_18
©
2008-2014, 2017
by Wm. Robert Johnston.
Last modified
18 February 2017.
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