(79360) Sila-Nunam
compiled by Wm. Robert Johnston
last updated 3 November 2012
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: |
43.939069 AU
| |
orbital period P: |
291.26 y (=106,383.61 d)
| |
eccentricity e: |
0.011162785
| |
perihelion distance q: |
43.448587 AU
| |
aphelion distance Q: |
44.429552 AU
| |
inclination i: |
2.241799°
| |
argument of perihelion omega: |
214.691161°
| |
ascending node OMEGA: |
304.340046°
| |
mean anomaly M: |
334.593196°
| |
perihelion passage TP: |
2032-10-02.97
| |
Epoch: |
14 MAR 2012
| |
data arc: |
1997-2011 (209 obs.)
|
orbital data, secondary:
|
semimajor axis a: |
2,777 ± 19 km [G12b]
| |
semimajor axis/primary radius a/Rp: |
(22)
| |
orbital period P: |
12.50995 ± 0.00036 d [G12b]
| |
eccentricity e: |
0.020 ± 0.015 [G12b]
| |
inclination i: |
103.51 ± 0.39 [G12b]
| |
argument of periapsis omega: |
326° ± 59° [G12b]
| |
ascending node OMEGA: |
140.76° ± 0.66° [G12b]
| |
mean anomaly M: |
16.3° ± 1.0° [G12b]
| |
other data, primary:
|
diameter: |
343 ± 42 km combined [G12b]
250 km ± 30 km [G12b]
| |
absolute magnitude H: |
5.51 ± 0.02 [G11a]
| |
rotation period: |
?
| |
amplitude delta M: |
?
| |
color index B-V: |
1.08 ± 0.03 [B05c]
| |
color index V-R: |
0.66 ± 0.04 [B05c]
| |
color index V-I: |
1.25 ± 0.03 [B05c]
| |
color index V-J: |
2.06 ± 0.03 [B05c]
| |
color index V-H: |
2.45 ± 0.08 [B05c]
| |
color index H-K: |
0.28 ± 0.23 [B01a]
| |
slope parameter G: |
(0.15) [a]
| |
geometric albedo: |
0.086 ± 0.026/0.017 V [G12b]
0.117 ± 0.035/0.024 V [G12b]
| |
mass (system): |
(1.084 ± 0.022) x 1019 kg [G12b]
| |
density: |
0.72 +0.37/-0.23 g/cm3 [G12b]
| |
BBFB type: |
RR [B05c]
|
other data, secondary:
|
diameter: |
236 ± 28 km [G12b]
| |
diameter ratio Ds/Dp: |
(0.95)
| |
component magnitude difference: |
0.12 [G11a]
| |
rotation period: |
?
|
|
--(79360) 1997 CS29--discovery and notes:
Primary discovered 3 February 1997 by J. X. Luu, D. C. Jewitt, C. A. Trujillo, and J. Chen from Mauna Kea observatory. Permanent number assigned 4 May 2004, name assigned 9 January 2012. Provisional designation 1997 CS29.
Companion discovered by Denise C. Stephens and Keith S. Noll from Hubble Space Telescope observations of 22 October 2002; announced 5 October 2005. W. M. Grundy et al., based on their orbit solution for the binary, report that mutual occultation/eclipses may occur over the period October 2011-May 2013.
Sila and Nunam are expected to undergo a series of mutual events from 24 October 2012 to 6 May 2013. [G12b]
See more information and links at
Asteroid/Comet Connection Catchall Catalog page
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Verbiscer, Anne J., Fisher, T. M., & French, R. G. 2010, Bulletin of the American Astronomical Society The Strongest Opposition Surges: Products of Ejecta Exchange?
- Rabinowitz, David L., Schaefer, B., Schaefer, M., & Tourtellotte, S. 2009, AAS/Division for Planetary Sciences Meeting Abstracts #41 Evidence for Recent Resurfacing of the Binary Kuiper Belt Object 1997 CS29
- Grundy, W. M., Buie, M. W., & Spencer, J. R. 2005, The Astronomical Journal Near-Infrared Spectrum of Low-Inclination Classical Kuiper Belt Object (79360) 1997 CS29
- Taniguchi, M., Sekiguchi, T., Itoh, Y., & Mukai, T. 2004, 35th COSPAR Scientific Assembly Photometry and Spectroscopy of TNOs with the Subaru Telescope
- Barucci, M. A., Romon, J., Doressoundiram, A., & Tholen, D. J. 2000, Astronomical Journal Compositional Surface Diversity in the Trans-Neptunian Objects
- Barucci, M. A., Romon, J., Le Bras, A., Fulchignoni, M., & Tholen, D. 1999, AAS/Division for Planetary Sciences Meeting Abstracts #31 Broad Band Optical Colors of Trans-Neptunian Objects
- Jewitt, D., Williams, G. V., & Marsden, B. G. 1997, Minor Planet Electronic Circulars 1997 CS29
- Luu, J., Jewitt, D., Trujillo, C., Chen, J., Brown, W. R., Hergenrother, C. W., Spahr, T. B., Offutt, W., & Marsden, B. G. 1997, Minor Planet Electronic Circulars 1997 CS29
© 2005, 2012 by Wm. Robert Johnston.
Last modified 3 November 2012.
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