1998 WW31 and S/2000 (1998 WW31) 1
compiled by Wm. Robert Johnston
last updated 1 March 2006
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: |
44.5756757713217 AU
| |
orbital period P: |
297.6152 y (=108706 d)
| |
eccentricity e: |
0.0857860293266722
| |
perihelion distance q: |
40.7517055423468 AU
| |
aphelion distance Q: |
48.399646 AU
| |
inclination i: |
6.80832424911238°
| |
argument of perihelion omega: |
50.042473459635°
| |
ascending node OMEGA: |
237.10314722883°
| |
mean anomaly M: |
125.053794464°
| |
perihelion passage TP: |
1901-09-12.3289346
| |
Epoch: |
30 JAN 2005
| |
data arc: |
1998-2001 (26 obs.)
|
orbital data, secondary:
|
semimajor axis a: |
22300 ± 800 km [V02a]
| |
semimajor axis/primary radius a/Rp: |
(170)
| |
orbital period P: |
574 ± 10 d [V02a]
| |
eccentricity e: |
0.817 ± 0.05 [V02a]
| |
periapse distance q: |
(4100 ± 1200 km)
| |
inclination i: |
41.7° ± 7° [V02a]
| |
periapse longitude omega: |
235.8° ± 7° [V02a]
| |
node longitude OMEGA: |
94.3° ± 8° [V02a]
| |
mean anomaly M: |
43.4° ± 4° [V02a]
| |
Epoch: |
JD 2452300.5
| |
other data, primary:
|
diameter: |
133 ± 15 km [V02a]
| |
absolute magnitude H: |
6.05 [JPL]
| |
rotation period: |
?
| |
amplitude delta M: |
?
| |
color index B-V: |
?
| |
color index V-R: |
?
| |
color index R-I: |
?
| |
color index R-J: |
1.49 ± 0.21 [T03a]
| |
color index J-H: |
0.34 ± 0.23 [T03a]
| |
color index H-K: |
-0.32 ± 0.38 [T03a]
| |
slope parameter G: |
(0.15) [a]
| |
geometric albedo: |
0.07 ± 0.02 [V02a]
| |
mass (system): |
1.7x1018 kg [A3a]
| |
density: |
(1.5 g/cm3) [a]
| |
type: |
?
|
other data, secondary:
|
diameter: |
110 ± 12 km [V02a]
| |
diameter ratio Ds/Dp: |
0.83 [V02a]
| |
component magnitude difference: |
0.4 [V02a]
| |
color index R-J: |
0.98 ± 0.21 [T03a]
| |
color index J-H: |
1.13 ± 0.23 [T03a]
| |
color index H-K: |
-0.24 ± 0.38 [T03a]
| |
rotation period: |
?
|
|
--1998 WW31--discovery and notes:
Primary discovered 18 November 1998 from Kitt Peak, Arizona, USA, by M. W. Buie.
Companion discovered 22 December 2000 by Christian Veillet, Joshua Shapiro, and Alain Doressoundiram from the CFHT; announced 16 April 2001. 1998 WW31 is a Kupier Belt or trans-Neptunian object, and the first of this class found to have a satellite.
See more information and links at
Asteroid/Comet Connection Catchall Catalog page
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Petit, J.-M. & Mousis, O. 2004, Icarus KBO binaries: how numerous were
they?
- Takato, Naruhisa, Fuse, Tetsuharu, Gaessler, Wolfgang, Goto, Miwa, Kanzawa,
Tomio, Kobayashi, Naoto, Minowa, Yosuke, Oya, Shin, Pyo, Tae-Soo,
Saint-Jacque, D., Takami, Hideki, Terada, Hiroshi, Hayano, Yutaka, Iye,
Masanori, Kamata, Yukiko, & Tokunaga, A. T. 2003, Earth Moon and Planets
Near-Infrared Colors of the Binary Kuiper Belt Object 1998 WW<SUB>31</SUB>
- Millis, R. L., Buie, M. W., Wasserman, L. H., Elliot, J. L., Kern, S. D., Clancy, K., Wagner, R. M., Chiang, E. I., Jordan, A., Trilling, D. E., & Meech, K. J. 2002, AAS/Division for Planetary Sciences Meeting The Deep Ecliptic Survey - A Status Report
- Veillet, C., Griffin, I. P., & Parker, J. Wm. 2002, AAS/Division for Planetary Sciences Meeting Dynamics of the Binary KBO 1998 WW31 and Predictions of Mutual Eclipses
- Veillet, Christian, Parker, Joel Wm., Griffin, Ian, Marsden, Brian, Doressoundiram, Alain, Buie, Marc, Tholen, David J., Connelley, Michael, & Holman, Matthew J. 2002, Nature The binary Kuiper-belt object 1998 WW31
- Noll, K., Stephens, D., Grundy, W., Spencer, J., Millis, R., Buie, M., Cruikshank, D., Tegler, S., & Romanishin, W. 2002, International Astronomical Union Circular 1997 CQ_29
- Parker, J. W., Veillet, C., & Griffin, I. 2001, American Geophysical Union, Fall Meeting 2001, abstract #P32A-0547 Multiplicity in the Kuiper Belt: The First Discovery of a Binary Trans-Neptunian Object
- Millis, R. L., Buie, M. W., Wasserman, L. H., Elliot, J. L., Kern, S. D., Wagner, R. M., Chiang, E., & Trilling, D. 2001, American Astronomical Society, DPS meeting #33, #06.01 The Deep Ecliptic Survey -- A Status Report
- Veillet, C., Parker, J. W., Griffin, I. P., Marsden, B. G., Doressoundiram, A., Tholen, D. J., Buie, M. W., & Holman, M. J. 2001, American Astronomical Society, DPS meeting #33, #06.05 Multiplicity in the Kuiper Belt: The First Discovery of a Binary Trans-Neptunian Object
- Tholen, D. J. & Connelley, M. S. 2001, American Astronomical Society, DPS meeting #33, #41.12 Recent Results from Follow-up Astrometric Observations of KBOs and NEOs
- Veillet, C., Doressoundiram, A., Shapiro, J., Buie, M. W., & Marsden, B. G. 2001, Minor Planet Electronic Circ., 2001-G29 (2001). 1998 WW31
- Millis, R. L., Buie, M. W., Wagner, R. M., Willmarth, D. W., Smith, P. S., Harmer, D. L., Saha, A., Elliot, J. L., Holman, M. J., Grav, T., & Marsden, B. G. 1999, Minor Planet Electronic Circ., 1999-B24 (1999). 1998 WW31
© 2001-2005, 2006 by Wm. Robert Johnston.
Last modified 1 March 2006.
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