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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 124 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1702603055396135 3.2053e-08  
a 2.976822651103346 7.7347e-09 au
q 2.469987916989248 9.4797e-08 au
i 8.590967437432171 3.8213e-06 deg
node 184.9850108400011 2.3722e-05 deg
peri 289.1127733990655 2.6496e-05 deg
M 17.8971398321458 1.2603e-05 deg
tp 2458907.237081921060
(2020-Feb-27.73708192)
6.5513e-05 TDB
period 1875.978554300247
5.14
7.3115e-06
2.002e-08
d
yr
n .1918998483083846 7.4792e-10 deg/d
Q 3.483657385217444 9.0516e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3241  
   data-arc span      58275 days (159.55 yr)  
   first obs. used      1861-04-29  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42743  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 19:31:17  

Additional Information
 Earth MOID = 1.50238 au 
 Jupiter MOID = 1.70641 au 
 T_jup = 3.222 
[ hide covariance matrix ]
Orbital Elements at Epoch 2454304.5 (2007-Jul-23.0) TDB
Reference: JPL 124 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1679548282777342 3.2216e-08  
q 2.47751719172965 9.5095e-08 au
tp 2455160.283442729215
(2009-Nov-24.78344273)
6.1727e-05 TDB
node 185.077426774259 2.375e-05 deg
peri 289.9264801367241 2.6592e-05 deg
i 8.582113821367001 3.8185e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3241  
   data-arc span      58275 days (159.55 yr)  
   first obs. used      1861-04-29  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42743  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 19:31:17  

Additional Information
 Jupiter MOID = 1.70641 au 
 T_jup = 3.222 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.037898448024911E-15 -3.056870548189481E-15 -1.154094718307005E-13 7.475945426724657E-15 -3.227242994511068E-15 4.696456912683513E-16
q -3.056870548189481E-15 9.043133614469543E-15 4.018278358794302E-13 -2.042586873065366E-14 1.327287432867317E-14 -8.289886299407164E-16
tp -1.154094718307005E-13 4.018278358794302E-13 3.810246715886985E-9 -1.378945800112508E-11 7.490501260341134E-10 1.196608965242185E-12
node 7.475945426724657E-15 -2.042586873065366E-14 -1.378945800112508E-11 5.64068369779622E-10 -5.601387918409557E-10 1.036747154004028E-11
peri -3.227242994511068E-15 1.327287432867317E-14 7.490501260341134E-10 -5.601387918409557E-10 7.07134438524914E-10 -9.968380548200426E-12
i 4.696456912683513E-16 -8.289886299407164E-16 1.196608965242185E-12 1.036747154004028E-11 -9.968380548200426E-12 1.458104710077207E-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. 2020-October); 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

[ show close-approach data ]
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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