1998 ST27
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: |
0.819353248904497 AU
| |
orbital period P: |
0.7417 y (=270.9 d)
| |
eccentricity e: |
0.530089165802822
| |
perihelion distance q: |
0.38502296869488 AU
| |
aphelion distance Q: |
1.25368353 AU
| |
inclination i: |
21.0494731140651°
| |
argument of perihelion omega: |
322.417334411007°
| |
ascending node OMEGA: |
197.616498369159°
| |
mean anomaly M: |
69.3337711632574°
| |
perihelion passage TP: |
2004-12-08.8267947
| |
Epoch: |
30 JAN 2005
| |
data arc: |
1998-2004 (303 obs.)
|
orbital data, secondary:
|
semimajor axis a: |
4.5 ± 0.5 km [A3a]
<=7 km [B03a]
| |
semimajor axis/primary radius a/Rp: |
16.5 ± 3.5 [A3a]
| |
orbital period P: |
~100 h [OOa]
| |
eccentricity e: |
>0.3 [B03a]
| |
other data, primary:
|
diameter: |
0.8 km [B03a]
| |
absolute magnitude H: |
19.49 [JPL]
| |
rotation period: |
<3.1 h? [OOa]
| |
amplitude delta M: |
?
| |
color index B-V: |
?
| |
color index V-R: |
?
| |
color index R-I: |
?
| |
slope parameter G: |
(0.15) [a]
| |
geometric albedo: |
0.05 [B03a]
| |
mass: |
?
| |
density: |
?
| |
type: |
C [OOa]
|
other data, secondary:
|
diameter: |
0.12 km [B03a]
| |
diameter ratio Ds/Dp: |
(0.15) [B03a]
| |
component magnitude difference: |
?
| |
rotation period: |
<6 h [B03a]
|
|
--1998 ST27--discovery and notes:
Primary discovered 24 September 1998 by the LINEAR program, Lincoln Laboratory ETS, New Mexico, USA.
Companion discovered from radar observations made 7-9 October 2001 at the Arecibo Observatory by L. A. M. Benner, M. C. Nolan, S. J. Ostro, J. D. Giorgini, and J. L. Margot; announced 9 October 2001.
See more information and links at
Asteroid/Comet Connection Catchall Catalog page
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Benner, L. A. M., Nolan, M. C., Margot, J. L., Ostro, S. J., & Giorgini, J. D. 2003, AAS/Division for Planetary Sciences Meeting Radar Imaging of Binary Near-Earth Asteroid 1998 ST27
- Abell, P. A., Gaffey, M. J., & Hardersen, P. S. 2002, Lunar and Planetary Institute Conference Abstracts A Detailed Compositional Investigation of the Potentially Hazardous Asteroid 1998 ST27
- Benner, L. A. M., Nolan, M. C., Ostro, S. J., Giorgini, J. D., & Margot, J. L. 2001, International Astronomical Union Circular 1998 ST_27
- Ticha, J., Tichy, M., Moravec, Z., Spratt, C. E., Balam, D. D., & Marsden, B. G. 2001, Minor Planet Electronic Circ., 2001-S28 (2001). 1998 ST27
- Ticha, J., Tichy, M., Moravec, Z., Garradd, G. J., Zoltowski, F. B., Pravec, P., Sarounova, L., Kubat, J., Blythe, M., Shelly, F., Bezpalko, M., Stuart, J., Viggh, H., Sayer, R., & Williams, G. V. 1998, Minor Planet Electronic Circ., 1998-S34 (1998). 1998 ST27
© 2002-2004, 2005 by Wm. Robert Johnston.
Last modified 1 September 2005.
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