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 ]  
685 Hermia (A909 PC)
Classification: Main-belt Asteroid          SPK-ID: 2000685
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ hide orbit diagram ]

For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


[ revert to old Java-based viewer ]

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .196290071242097 3.074e-08  
a 2.235801148109726 5.1276e-09 au
q 1.796935581464105 6.9491e-08 au
i 3.646756703894968 3.3524e-06 deg
node 235.2030901803766 5.4831e-05 deg
peri 80.67370923653708 5.551e-05 deg
M 57.03464280639888 8.8547e-06 deg
tp 2458807.043015314461
(2019-Nov-19.54301531)		 2.9883e-05 TDB
period 1221.091446530117
3.34		 4.2007e-06
1.15e-08		 d
yr
n .2948182144940781 1.0142e-09 deg/d
Q 2.674666714755346 6.1341e-09 au
   Orbit Determination Parameters
   # obs. used (total)      3074  
   data-arc span      35045 days (95.95 yr)  
   first obs. used      1923-12-14  
   last obs. used      2019-11-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44793  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 20:47:12  

Additional Information
 Earth MOID = .787815 au 
 Jupiter MOID = 2.61901 au 
 T_jup = 3.610 
[ 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 12.0   n/a MPO324309  
diameter diameter 10.95 km 0.9 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2
rotation period rot_per 50.40 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Stephens, R.D. (2007) Minor Planet Bull. 34, 14-15.]
[Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.]
[Kryszczynska, A.; Colas, F.; Polinska, M.; Hirsch, R.; et al. (2012) Astron. Astrophys. 546, A72.]
geometric albedo albedo 0.2807   0.050 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2

685 Hermia (A909 PC)          Discovered 1909-Aug-12 by Lorenz, W. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Mar-28 19:02 UT
(server date/time)   		NASA Home Page
Site Manager:   Ryan S. Park
Webmaster:   Alan B. Chamberlin