(31345) 1998 PG
compiled by Wm. Robert Johnston
last updated 1 September 2005
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: |
2.01505428781446 AU
| |
orbital period P: |
2.8605 y (=1044.8 d)
| |
eccentricity e: |
0.391951752787982
| |
perihelion distance q: |
1.22525022774264 AU
| |
aphelion distance Q: |
2.80485835 AU
| |
inclination i: |
6.48741352718659°
| |
argument of perihelion omega: |
155.736894790133°
| |
ascending node OMEGA: |
222.875319516801°
| |
mean anomaly M: |
71.2566650657807°
| |
perihelion passage TP: |
2004-07-07.1995186
| |
Epoch: |
30 JAN 2005
| |
data arc: |
1978-2005 (633 obs.)
|
orbital data, secondary:
|
semimajor axis a: |
(1.5 km)
| |
semimajor axis/primary radius a/Rp: |
3.4? [P00a]
| |
orbital period P: |
14.007 ± 0.0014 h [P00a]
| |
eccentricity e: |
?
| |
other data, primary:
|
diameter: |
0.9 km [P00a]
| |
absolute magnitude H: |
17.64 ± 0.14 [P00a]
| |
rotation period: |
2.51620 ± 0.00003 h [P00a]
| |
amplitude delta M: |
0.11 [MPb]
| |
color index B-V: |
0.81 ± 0.02 [P00a]
| |
color index V-R: |
0.44 ± 0.01 [P00a]
| |
color index R-I: |
0.32 ± 0.01 [P00a]
| |
slope parameter G: |
(0.15) [a]
| |
geometric albedo: |
0.16 [a]
| |
mass: |
?
| |
density: |
?
| |
type: |
Sq [SBd]
|
other data, secondary:
|
diameter: |
(0.3 km)
| |
diameter ratio Ds/Dp: |
>=0.3 [P00a]
| |
component magnitude difference: |
?
| |
rotation period: |
?
|
|
--(31345) 1998 PG--discovery and notes:
Primary discovered 3 August 1998 by the LONEOS program at Anderson Mesa, Arizona, USA, but linked to prediscovery observations from 1978.
Companion discovered by analyzing observations from 29 August-25 October 1998 by Petr Pravec, Lenka Sarounová, David L. Rabinowitz, Michael D. Hicks, Marek Wolf, Yurij N. Krugly, Fiodor P. Velichko, Vasilij G. Shevchenko, Vasilij G. Chiorny, Ninel M. Gaftonyuk, and Guy Genevier. The observations were made from Ondrejov Observatory, Kharkiv, Table Mountain Observatory, and Simeiz. Identification as binary is considered inconclusive.
See more information and links at
Asteroid/Comet Connection Catchall Catalog page
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Pravec, Petr, Sarounová, Lenka, Rabinowitz, David L., Hicks, Michael D., Wolf, Marek, Krugly, Yurij N., Velichko, Fiodor P., Shevchenko, Vasilij G., Chiorny, Vasilij G., Gaftonyuk, Ninel M., & Genevier, Guy 2000, Icarus, Volume 146, Issue 1, pp. 190-203 (2000). Two-Period Lightcurves of 1996 FG3, 1998 PG, and (5407) 1992 AX: One Probable and Two Possible Binary Asteroids
- Kiss, L. L., Szabó, Gy., & Sárneczky, K. 1999, Astronomy and Astrophysics Supplement, v.140, p.21-28 CCD photometry and new models of 5 minor planets
- HELIN, E. F., LAWRENCE, K. J., & WILLIAMS, G. V. 1999, Minor Planet Electronic Circ., 1999-J38 (1999). 1998 PG
- Tichy, M., Moravec, Z., Nakamura, A., Wolf, M., Sarounova, L., Stoss, R., Delp, S., Busch, M., Balam, D. D., Onken, C. A., Casarramona, F., Vigil, E., Oscoz, A., Osorio, M. R., & Williams, G. V. 1998, Minor Planet Electronic Circ., 1998-P13 (1998). 1998 PG
© 2001-2004, 2005 by Wm. Robert Johnston.
Last modified 1 September 2005.
Return to Home. Return to Astronomy and Space. Return to Asteroids with Satellites.