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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 128 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1701766955493798 3.1464e-08  
a 2.976238731183388 8.2211e-09 au
q 2.46975225874452 9.2442e-08 au
i 8.591898144535715 3.8204e-06 deg
node 184.9822286527411 2.3219e-05 deg
peri 289.0562485926264 2.6078e-05 deg
M 56.33516591694404 1.2766e-05 deg
tp 2458907.020919357472
(2020-Feb-27.52091936)
6.5944e-05 TDB
period 1875.426606306182
5.13
7.7705e-06
2.127e-08
d
yr
n .1919563254512272 7.9534e-10 deg/d
Q 3.482725203622255 9.6201e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3465  
   data-arc span      58397 days (159.88 yr)  
   first obs. used      1861-04-29  
   last obs. used      2021-03-18  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41543  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 17:48:55  

Additional Information
 Earth MOID = 1.50207 au 
 Jupiter MOID = 1.70705 au 
 T_jup = 3.222 
[ hide covariance matrix ]
Orbital Elements at Epoch 2454497.5 (2008-Feb-01.0) TDB
Reference: JPL 128 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .168272272359856 3.1628e-08  
q 2.47597468188128 9.2721e-08 au
tp 2455159.930529095046
(2009-Nov-24.43052910)
6.1577e-05 TDB
node 185.0688850299444 2.3247e-05 deg
peri 289.9381725789891 2.6156e-05 deg
i 8.583347030004816 3.8176e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3465  
   data-arc span      58397 days (159.88 yr)  
   first obs. used      1861-04-29  
   last obs. used      2021-03-18  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41543  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 17:48:55  

Additional Information
 Jupiter MOID = 1.70705 au 
 T_jup = 3.222 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.000356877041807E-15 -2.925262896810443E-15 -6.74271002901634E-14 6.593515975176781E-15 6.994178717124126E-16 4.050070237103422E-16
q -2.925262896810443E-15 8.597224072516789E-15 2.729348313548497E-13 -1.793705605085574E-14 5.36825144077337E-15 -5.857963548490003E-16
tp -6.74271002901634E-14 2.729348313548497E-13 3.791695590524426E-9 -1.556859022408913E-11 7.494180162458824E-10 1.033558179234095E-12
node 6.593515975176781E-15 -1.793705605085574E-14 -1.556859022408913E-11 5.40428622470368E-10 -5.370693304779733E-10 1.074796018600854E-11
peri 6.994178717124126E-16 5.36825144077337E-15 7.494180162458824E-10 -5.370693304779733E-10 6.841253734067312E-10 -1.037403004647653E-11
i 4.050070237103422E-16 -5.857963548490003E-16 1.033558179234095E-12 1.074796018600854E-11 -1.037403004647653E-11 1.457441739726726E-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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