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69 Hesperia (A861 HC)
Classification: Main-belt Asteroid          SPK-ID: 2000069
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 122 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1702603038572768 3.2088e-08  
a 2.976822652210646 7.7982e-09 au
q 2.469987922916037 9.4936e-08 au
i 8.590967392967034 3.8304e-06 deg
node 184.9850105271513 2.3774e-05 deg
peri 289.1127747319172 2.6567e-05 deg
M 17.89713810682225 1.2732e-05 deg
tp 2458907.237090859773
(2020-Feb-27.73709086)
6.6182e-05 TDB
period 1875.978555346969
5.14
7.3715e-06
2.018e-08
d
yr
n .1918998482013121 7.5406e-10 deg/d
Q 3.483657381505255 9.1259e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3198  
   data-arc span      58071 days (158.99 yr)  
   first obs. used      1861-04-29  
   last obs. used      2020-04-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4281  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 00:57:44  

Additional Information
 Earth MOID = 1.50238 au 
 Jupiter MOID = 1.70641 au 
 T_jup = 3.222 
[ hide covariance matrix ]
Orbital Elements at Epoch 2454261.5 (2007-Jun-10.0) TDB
Reference: JPL 122 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1678713922360125 3.2251e-08  
q 2.477930661008045 9.5247e-08 au
tp 2455160.428763369090
(2009-Nov-24.92876337)
6.2226e-05 TDB
node 185.0804458463851 2.3803e-05 deg
peri 289.9301924285473 2.6668e-05 deg
i 8.581871639475031 3.8276e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3198  
   data-arc span      58071 days (158.99 yr)  
   first obs. used      1861-04-29  
   last obs. used      2020-04-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4281  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 00:57:44  

Additional Information
 Jupiter MOID = 1.70641 au 
 T_jup = 3.222 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.040133866636439E-15 -3.064934240492575E-15 -1.230365041294834E-13 7.444785891828598E-15 -4.208395352026231E-15 4.627070627986493E-16
q -3.064934240492575E-15 9.071924895779842E-15 4.281125384123228E-13 -2.039382834742539E-14 1.660350532230535E-14 -8.376231845890475E-16
tp -1.230365041294834E-13 4.281125384123228E-13 3.872125093220127E-9 -1.375826072289271E-11 7.588449675385059E-10 1.28192428726492E-12
node 7.444785891828598E-15 -2.039382834742539E-14 -1.375826072289271E-11 5.665832757030145E-10 -5.626199024080002E-10 1.076028477837369E-11
peri -4.208395352026231E-15 1.660350532230535E-14 7.588449675385059E-10 -5.626199024080002E-10 7.111789989314383E-10 -1.034019994243859E-11
i 4.627070627986493E-16 -8.376231845890475E-16 1.28192428726492E-12 1.076028477837369E-11 -1.034019994243859E-11 1.465043631043043E-11

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 7.2   n/a MPO492748 IRAS observations used: 3
magnitude slope G 0.19   n/a PDS3 (MPC 17257) Fit
diameter diameter 138.13 km 4.7 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 3
rotation period rot_per 5.655 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Poutanen, M.; Bowell, E.; Martin, L.J.; Thompson, D.T. (1985) Astron. Astrophys. Suppl. Ser. 61, 291-297.]
[Di Martino, M.; Zappala, V.; De Sanctis, G.; Cacciatori, S. (1987) Icarus 69, 338-353.]
[Velichko, F.P.; Krugly, Yu.N. (1989) In "Methods of investigation of movement, physics and dynamic of Solar System small bodies, Dushanbe, p. 14-15 (in Russian).]
[De Angelis, G.; Mottola, S. (1995) Planet. Space Sci. 43, 1013-1017.]
[Hainaut-Rouelle, M.-C.; Hainaut, O.R.; Detal, A. (1995) Astron. Astrophys. Suppl. Ser. 112, 125-142.]
[Behrend, R. (2002) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.]
[Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.]
[Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.]
[Shevchenko, V.G.; Velichko, F.P.; Checha, V.A.; Krugly, Y.N. (2014) Minor Planet Bull. 41, 195-198.]
[Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.1402   0.010 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 3
B-V BV 0.674   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=6.83, mean=7.96, max.=9.99) deg.
U-B UB 0.230   0.045 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=6.83, mean=7.96, max.=9.99) deg.
Tholen spectral type spec_T M   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B X   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)

69 Hesperia (A861 HC)          Discovered 1861-Apr-29 by Schiaparelli, G. at Milan
Reference: 20150829/MPCPages.arcLast Updated: 2015-09-02

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Alternate Designations
 A861 HC = 1932 CM1 = 1945 NB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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