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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 
[ 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 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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1915-Sep-17 15:16 00:01 Jupiter 1.83751267562886 1.83751197175463 1.83751337950445 3.28355824387381 3.14003691647071 2420758.135921832 1.19404263090139 105.046447892267 14.0229896285231 78.4006430697301 2816451.5898636 T 128 CATAB v2.0g-lin.ifort 2021-May-03 17:49:42 2021-May-03 17:49
1960-Oct-15 21:17 < 00:01 Jupiter 1.87323115810073 1.87323069746297 1.87323161873827 1.65726574795909 1.35727150519878 2437223.386913368 0.739857686300053 49.8227818092413 34.8785602423009 -34.8996815168388 2372831.16088222 T 128 CATAB v2.0g-lin.ifort 2021-May-03 17:49:42 2021-May-03 17:49
1997-Apr-14 07:21 < 00:01 Jupiter 1.74102356490949 1.74102318155133 1.74102394826745 1.66624504424916 1.34289085068505 2450552.806309242 0.252172274532096 75.4445080651279 62.4773953273355 50.5256238508207 2149519.59978998 T 128 CATAB v2.0g-lin.ifort 2021-May-03 17:49:42 2021-May-03 17:49
2033-Sep-24 07:44 < 00:01 Jupiter 1.72383996824263 1.72383960468464 1.72384033180053 2.52091544037837 2.31782197616885 2463864.822241839 0.386375468668967 53.0989850347171 16.5468776678833 87.7077951659246 2571165.02052504 T 128 CATAB v2.0g-lin.ifort 2021-May-03 17:49:42 2021-May-03 17:49
2070-Feb-25 06:15 < 00:01 Jupiter 1.85780726030423 1.85780676927524 1.85780775133364 3.4782451406961 3.34459824043671 2477167.760612285 0.838900837871419 75.0982655527566 14.5117698718535 79.4731270570044 3166680.50141278 T 128 CATAB v2.0g-lin.ifort 2021-May-03 17:49:42 2021-May-03 17:49
2115-Apr-09 22:31 00:02 Jupiter 1.84342332932871 1.8434225577053 1.84342410095139 1.57994400159752 1.25588858909856 2493646.438344188 1.51488277282099 73.6048805084796 51.5824186134296 -52.4332251008305 1917068.55112027 T 128 CATAB v2.0g-lin.ifort 2021-May-03 17:49:42 2021-May-03 17:49
2151-Oct-04 21:11 00:02 Jupiter 1.70781277492466 1.70781225000684 1.70781329984364 1.94363636812032 1.66906679323742 2506973.382412067 1.90751967744964 122.566907374963 51.6831030152501 -58.2718876364682 1870581.47890507 T 128 CATAB v2.0g-lin.ifort 2021-May-03 17:49:42 2021-May-03 17:49
2188-Mar-08 00:54 00:02 Jupiter 1.7203631473548 1.72036259615181 1.72036369856317 2.76404131493318 2.57977177212958 2520277.537818126 2.33513174072249 206.708561798084 14.1131492318005 89.5212671700151 2504060.6159 T 128 CATAB v2.0g-lin.ifort 2021-May-03 17:49:42 2021-May-03 17:49

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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