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 ]  
798 Ruth (A914 WH)
Classification: Main-belt Asteroid          SPK-ID: 2000798
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03567275602588639 3.8011e-08  
a 3.015372374216271 1.3979e-08 au
q 2.907805731183656 1.1241e-07 au
i 9.238593714661906 4.6084e-06 deg
node 214.2683503841145 2.3848e-05 deg
peri 43.09170614727944 6.6141e-05 deg
M 154.1636304248595 6.2048e-05 deg
tp 2457781.489852592954
(2017-Jan-27.98985259)
0.00032901 TDB
period 1912.537037782369
5.24
1.3299e-05
3.641e-08
d
yr
n .1882316487932847 1.3089e-09 deg/d
Q 3.122939017248886 1.4477e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2736  
   data-arc span      50937 days (139.46 yr)  
   first obs. used      1880-05-15  
   last obs. used      2019-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43214  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 01:57:36  

Additional Information
 Earth MOID = 1.90131 au 
 Jupiter MOID = 1.88004 au 
 T_jup = 3.227 
[ 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 9.6   n/a MPO384752  
diameter diameter 43.19 km 2.9 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 37
rotation period rot_per 8.550 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Stephens, R.D. (2003) Minor Planet Bull. 30, 1-2.]
[Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Stephens, R.D. (2012) Posting on CALL web site. http://www.minorplanet.info/call.html]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.1587   0.024 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 37
B-V BV 0.797   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=5.95, mean=12.08, max.=15.15) deg.
U-B UB 0.407   0.031 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=5.95, mean=12.08, max.=15.15) deg.
Tholen spectral type spec_T M   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 4 color indices; used ground-based radiometric albedo

798 Ruth (A914 WH)          Discovered 1914-Nov-21 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A914 WH = 1945 VJ = 1955 SN = A880 JA = A917 KA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin