(26308) 1998 SM165 and S/2001 (26308) 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: |
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: |
238 ± 54 km [G05b]
| |
absolute magnitude H: |
5.8 [JPL]
| |
rotation period: |
7.98 h [A3a]
| |
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: |
0.14 ± 0.06 [G05b]
| |
mass (system): |
(6.78 ± 0.24)x1018 kg [M04b]
| |
density: |
(1.0 g/cm3) [a]
| |
BBFB type: |
RR [B05c]
|
other data, secondary:
|
diameter: |
(78 km)
| |
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 1 March 2006.
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