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826 Henrika (A916 HD)
Classification: Main-belt Asteroid          SPK-ID: 2000826
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2060005205043462 3.1186e-08  
a 2.711850919327057 9.1738e-09 au
q 2.153208218415493 8.5639e-08 au
i 7.104777606413102 4.114e-06 deg
node 230.2171293249261 2.8847e-05 deg
peri 36.69665076379792 3.0651e-05 deg
M 51.96219523166358 1.038e-05 deg
tp 2458765.058978707573
(2019-Oct-08.55897871)
4.7002e-05 TDB
period 1631.162180261878
4.47
8.277e-06
2.266e-08
d
yr
n .2207015368283018 1.1199e-09 deg/d
Q 3.270493620238621 1.1064e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2693  
   data-arc span      38157 days (104.47 yr)  
   first obs. used      1916-04-03  
   last obs. used      2020-09-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43325  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Oct-22 15:29:50  

Additional Information
 Earth MOID = 1.14242 au 
 Jupiter MOID = 1.82967 au 
 T_jup = 3.321 
[ 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 11.6   n/a MPO347520  
diameter diameter 22.556 km 0.258 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 5.9846 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Albers, K.; Kragh, K.; Monnier, A.; Pligge, Z.; et al. (2010) Minor Planet Bull. 37, 152-158.]
[Pilcher, F. (2010) Minor Planet Bull. 37, 148-149.]
geometric albedo albedo 0.166   0.025 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
SMASSII spectral type spec_B C   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)

826 Henrika (A916 HD)          Discovered 1916-Apr-28 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A916 HD = 1930 MG = 1934 HE = 1935 SW1 = 1948 PJ1 = 1957 QC = 1962 UK = 1962 VC 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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