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
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 ]  
103 Hera
Classification: Main-belt Asteroid          SPK-ID: 2000103
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ 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 112 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07923612316446907 3.6089e-08  
a 2.7021409744893 7.2983e-09 au
q 2.488033799426908 9.7419e-08 au
i 5.418345971747123 4.0821e-06 deg
node 136.0797430481864 4.1262e-05 deg
peri 188.6794966568636 4.844e-05 deg
M 83.70336251686237 2.609e-05 deg
tp 2458623.274680198537
0.00011736 TDB
period 1622.409316007695
n .2218922169935891 8.9897e-10 deg/d
Q 2.916248149551693 7.8766e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2567  
   data-arc span      54361 days (148.83 yr)  
   first obs. used      1871-04-04  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51204  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:17:03  

Additional Information
 Earth MOID = 1.47591 au 
 Jupiter MOID = 2.33207 au 
 T_jup = 3.356 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 7.6   n/a MPO492749 IRAS observations used: 25
diameter diameter 83.908 km 2.091 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 23.740 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Harris, A.W.; Young, J.W. (1983) Icarus 54, 59-109.]
[Pilcher, F.; Higgins, D. (2011) Minor Planet Bull. 38, 32.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.217   0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.853   0.012 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=3.66, mean=7.54, max.=19.73) deg.
U-B UB 0.441   0.015 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=8; phase (min.=3.66, mean=9.26, max.=21.25) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

103 Hera          Discovered 1868-Sep-07 by Watson, J. C. at Ann Arbor
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1927 CV = 1950 CM 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
FirstGov 2020-Apr-08 22:41 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin