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103 Hera (A868 RA)
Classification: Main-belt Asteroid          SPK-ID: 2000103
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
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
(2019-May-19.77468020)
0.00011736 TDB
period 1622.409316007695
4.44
6.573e-06
1.8e-08
d
yr
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455046.5 (2009-Aug-03.0) TDB
Reference: JPL 112 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08027804013722764 3.633e-08  
q 2.484418102856084 9.8194e-08 au
tp 2455386.828293364668
(2010-Jul-09.32829336)
0.00011394 TDB
node 136.2716245020434 4.1193e-05 deg
peri 190.4292999756296 4.8102e-05 deg
i 5.422238940810766 4.0867e-06 deg
  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
 Jupiter MOID = 2.33207 au 
 T_jup = 3.356 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.31988139909309E-15 -3.558900155506693E-15 -2.763783274267181E-13 -1.949418189302924E-15 -5.972199004903122E-14 -4.273409048735689E-17
q -3.558900155506693E-15 9.642095484447757E-15 7.223810484185205E-13 4.539193723969593E-15 1.535411340764135E-13 1.752534186314481E-16
tp -2.763783274267181E-13 7.223810484185205E-13 1.298298745272887E-8 1.822178018237394E-12 2.847651481606809E-9 3.251034975226693E-13
node -1.949418189302924E-15 4.539193723969593E-15 1.822178018237394E-12 1.696852615406963E-9 -1.688239022402233E-9 -4.644063134962816E-12
peri -5.972199004903122E-14 1.535411340764135E-13 2.847651481606809E-9 -1.688239022402233E-9 2.313798012968086E-9 4.704498490747515E-12
i -4.273409048735689E-17 1.752534186314481E-16 3.251034975226693E-13 -4.644063134962816E-12 4.704498490747515E-12 1.670138074530351E-11

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] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
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] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
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 (A868 RA)          Discovered 1868-Sep-07 by Watson, J. C. at Ann Arbor
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A868 RA = 1927 CV = 1950 CM 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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