Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
IMPORTANT: The SSD Announcement email list is now available. Major changes are coming in the near future, including possible hostname and/or URL changes. To be notified of such changes, subscribe to this email list.

Please visit this page for more details.


JPL Small-Body Database Browser
Search: [ help ]  
5771 Somerville (1987 ST1)
Classification: Main-belt Asteroid          SPK-ID: 2005771
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .216511680659008 4.0677e-08  
a 3.140459087510131 2.1729e-08 au
q 2.460513012432458 1.2438e-07 au
i 8.267524968187907 4.8906e-06 deg
node 287.9128354781332 3.1024e-05 deg
peri 102.9625848570004 3.3025e-05 deg
M 310.8754841361687 1.308e-05 deg
tp 2459277.885604931077
(2021-Mar-04.38560493)
7.5223e-05 TDB
period 2032.769504578672
5.57
2.1097e-05
5.776e-08
d
yr
n .1770982884134798 1.838e-09 deg/d
Q 3.820405162587804 2.6433e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1722  
   data-arc span      13399 days (36.68 yr)  
   first obs. used      1982-12-19  
   last obs. used      2019-08-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50709  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 17:46:21  

Additional Information
 Earth MOID = 1.48277 au 
 Jupiter MOID = 1.75768 au 
 T_jup = 3.158 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.3   n/a MPO309195  
diameter diameter 28.306 km 0.264 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 9.20 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Warner, B.D. (2012) Minor Planet Bull. 39, 158-167.]
geometric albedo albedo 0.029   0.001 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

5771 Somerville (1987 ST1)          Discovered 1987-Sep-21 by Bowell, E. at Flagstaff
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1987 ST1 = 1982 YY1 = 1989 BG1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Feb-23 14:00 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin