2008 BT18
compiled by Wm. Robert Johnston
last updated 10 August 2008
Orbital elements and other data (Assumed or derived values in parenthesis, my estimates in italics and parenthesis. Source identifications in brackets, see this link for sources):
orbital data, primary (osculating elements) [JPL]:
|
semimajor axis a: |
2.21926929 AU
| |
orbital period P: |
3.31 y (=1,207.57311 d)
| |
eccentricity e: |
0.59698778
| |
perihelion distance q: |
0.89439265 AU
| |
aphelion distance Q: |
3.54414593 AU
| |
inclination i: |
8.14983°
| |
argument of perihelion omega: |
139.04028°
| |
ascending node OMEGA: |
107.88767°
| |
mean anomaly M: |
351.6914718°
| |
perihelion passage TP: |
2008-06-10.869876
| |
Epoch: |
14 MAY 2008
| |
data arc: |
1955-2008 (223 obs.)
|
orbital data, secondary:
|
semimajor axis a: |
?
| |
semimajor axis/primary radius a/Rp: |
?
| |
orbital period P: |
?
| |
eccentricity e: |
?
| |
other data, primary:
|
diameter: |
0.6 km
| |
absolute magnitude H: |
18.207 ± 0.407 [JPL]
| |
rotation period: |
<3 h
| |
amplitude delta M: |
?
| |
color index B-V: |
?
| |
color index V-R: |
?
| |
color index R-I: |
?
| |
slope parameter G: |
(0.15) assumed
| |
geometric albedo: |
?
| |
mass: |
?
| |
density: |
?
| |
type: |
S
|
other data, secondary:
|
diameter: |
0.2 km
| |
diameter ratio Ds/Dp: |
?
| |
component magnitude difference: |
?
| |
rotation period: |
?
|
|
--2008 BT18--discovery and notes:
Primary discovered 31 January 2008 by the LINEAR program; linked to pre-discovery observations from 14 March 1955.
Companion reported 29 July 2008 based on radar observations in July 2008 from Arecibo.
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
© 2008 by Wm. Robert Johnston.
Last modified 10 August 2008.
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