(26308) 1998 SM165 and S/2001 (26308) 1
compiled by Wm. Robert Johnston
last updated 11 October 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: |
47.4109781076965 AU
| |
orbital period P: |
326.4574 y (=119241 d)
| |
eccentricity e: |
0.368467617927425
| |
perihelion distance q: |
29.9415679407442 AU
| |
aphelion distance Q: |
64.88038827 AU
| |
inclination i: |
13.5248864922825°
| |
argument of perihelion omega: |
130.505296058762°
| |
ascending node OMEGA: |
183.174348684175°
| |
mean anomaly M: |
33.5526525666883°
| |
perihelion passage TP: |
1974-08-27.7480978
| |
Epoch: |
30 JAN 2005
| |
data arc: |
1982-2002 (60 obs.)
| orbital data, secondary:
|
semimajor axis a: |
11,310 ± 110 km [M04b]
| |
semimajor axis/primary radius a/Rp: |
(54?)
| |
orbital period P: |
130.1 ± 1 d [M04b]
| |
eccentricity e: |
?
| |
other data, primary:
|
diameter: |
287 ± 36 km [S06b]
| |
absolute magnitude H: |
5.8 [JPL]
| |
rotation period: |
8.40 ± 0.05 h [S06b]
| |
amplitude delta M: |
?
| |
color index B-V: |
0.966 ± 0.091 [H02a]
| |
color index V-R: |
0.687 ± 0.079 [H02a]
| |
color index V-I: |
1.29 ± 0.07 [B05c]
| |
color index V-J: |
2.37 ± 0.01 [B05c]
| |
color index V-H: |
2.88 ± 0.08 [B05c]
| |
slope parameter G: |
(0.15) [a]
| |
geometric albedo: |
0.07 ± 0.02 [S06b]
| |
mass (system): |
(6.78 ± 0.24)x1018 kg [M04b]
| |
density: |
0.52 +0.29/-0.14 g/cm3 [S06b]
| |
BBFB type: |
RR [B05c]
|
other data, secondary:
|
diameter: |
96 ± 12 km [S06b]
| |
diameter ratio Ds/Dp: |
(0.33 ± 0.02) [M05b]
| |
component magnitude difference: |
(2.4) [M05b]
| |
rotation period: |
?
|
|
--(26308) 1998 SM165--discovery and notes:
Primary discovered 16 September 1998 from Steward Observatory, Kitt Peak-Spacewatch, Arizona, USA, by N. Danzl. Linked to prediscovery observations from 1982.
Companion discovered 22 December 2001 by M. E. Brown and C. A. Trujillo in Hubble Space Telescope images; announced 24 January 2002.
See more information and links at
Asteroid/Comet Connection Catchall Catalog page
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Margot, J. L., Brown, M. E., Trujillo, C. A., & Sari, R. 2004, AAS/Division
for Planetary Sciences Meeting Abstracts HST observations of Kuiper Belt
binaries
- Sheppard, Scott S. & Jewitt, David 2004, Astronomical Journal Extreme Kuiper Belt Object 2001 QG298 and the Fraction of Contact Binaries
- Brown, M. E. & Trujillo, C. A. 2002, International Astronomical Union Circular (26308) 1998 SM_165
- Romanishin, W., Tegler, S. C., Rettig, T. W., Consolmagno, G., & Botthof, B.
2001, Proceedings of the National Academy of Science 1998 SM165: A
large Kuiper belt object with an irregular shape
- Delsanti, A. C., Boehnhardt, H., Barrera, L., Meech, K. J., Sekiguchi, T., & Hainaut, O. R. 2001, Astronomy and Astrophysics BVRI Photometry of 27 Kuiper Belt Objects with ESO/Very Large Telescope
- Romanishin, W., Tegler, S. C., Rettig, T. W., Consolmagno, G., & Botthof, B. 2001, American Astronomical Society, DPS meeting #33, #06.06 (26308) 1998 SM165: A Large Kuiper Belt Object with an Irregular Shape
- McMillan, R. S., Larsen, J. A., May, B., Maggs J., D., Danzl, N., & Marsden, B. G. 1999, Minor Planet Electronic Circ., 1999-U17 (1999). 1998 SM165
- Danzl, N. & Marsden, B. G. 1999, Minor Planet Electronic Circ., 1999-M31 (1999). 1998 SM165
© 2003-2005, 2006 by Wm. Robert Johnston.
Last modified 11 October 2006.
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