(85938) 1999 DJ4
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: |
1.85238300985206 AU
| |
orbital period P: |
2.5212 y (=920.9 d)
| |
eccentricity e: |
0.483274007213759
| |
perihelion distance q: |
0.957174449786172 AU
| |
aphelion distance Q: |
2.74759157 AU
| |
inclination i: |
9.15349995835191°
| |
argument of perihelion omega: |
197.510290867754°
| |
ascending node OMEGA: |
20.0189409770589°
| |
mean anomaly M: |
108.636496030252°
| |
perihelion passage TP: |
2004-04-27.1132376
| |
Epoch: |
30 JAN 2005
| |
data arc: |
1999-2004 (543 obs.)
|
orbital data, secondary:
|
semimajor axis a: |
(1.5 km?)
| |
semimajor axis/primary radius a/Rp: |
(4?)
| |
orbital period P: |
17.72 ± 0.01 h [OOe]
| |
eccentricity e: |
?
| |
other data, primary:
|
diameter: |
(0.7 km?)
| |
absolute magnitude H: |
18.49 [JPL]
| |
rotation period: |
2.514 ± 0.001 h [OOe]
| |
amplitude delta M: |
0.10 [OOe]
| |
color index B-V: |
?
| |
color index V-R: |
?
| |
color index R-I: |
?
| |
slope parameter G: |
(0.15) [a]
| |
geometric albedo: |
?
| |
mass: |
?
| |
density: |
?
| |
type: |
?
|
other data, secondary:
|
diameter: |
(0.35 km?)
| |
diameter ratio Ds/Dp: |
0.5 ± 0.15 [OOe]
| |
component magnitude difference: |
?
| |
rotation period: |
?
|
|
--(85938) 1999 DJ4--discovery and notes:
Primary discovered 24 February 1999 by the LINEAR Program from Lincoln Laboratory ETS, Socorro, New Mexico, USA.
Companion discovered from lightcurve observations 21 February-28 March 2004 from Ondrejov Observatory, Elginfield Observatory, Ontario, and Tenagra II by Petr Pravec, Peter Kusnirak, Lenka Sarounova, Peter Brown, Nicole Kaiser, Gianluca Masi, and Franco Mallia.
See more information and links at
Asteroid/Comet Connection Catchall Catalog page
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Hergenrother, C. W., Spahr, T. B., & Williams, G. V. 2000, Minor Planet Circulars 1999 DJ4
- Tichy, M., Moravec, Z., Tombelli, M., Boattini, A., Tesi, L., Bartolini, S., Forti, G., Guidetti, D., Masotti, E., Kornos, L., Toth, J., Manca, F., Ghezzi, P., Blythe, M., Shelly, F., Bezpalko, M., Stuart, J., Viggh, H., Sayer, R., Koff, R. A., Griffin, I. P., Ikari, Y., & Williams, G. V. 1999, Minor Planet Circulars 1999 DJ4
© 2004, 2005 by Wm. Robert Johnston.
Last modified 1 September 2005.
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