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944 Hidalgo (A920 UB)
Classification: Centaur          SPK-ID: 2000944
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 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6605601800116458 4.3164e-08  
a 5.736008641048025 3.2362e-08 au
q 1.947029740568986 2.409e-07 au
i 42.52873144480633 8.6993e-06 deg
node 21.41636229822332 7.7402e-06 deg
peri 56.62368690432933 1.0177e-05 deg
M 41.79990677950906 2.6316e-06 deg
tp 2458417.879267768967
(2018-Oct-26.37926777)
3.4092e-05 TDB
period 5017.797401069598
13.74
4.2464e-05
1.163e-07
d
yr
n .07174462642179656 6.0716e-10 deg/d
Q 9.524987541527064 5.3739e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1707  
   data-arc span      36388 days (99.62 yr)  
   first obs. used      1920-10-31  
   last obs. used      2020-06-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .35414  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:23:35  

Additional Information
 Earth MOID = 1.15023 au 
 Jupiter MOID = .330849 au 
 T_jup = 2.069 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457654.5 (2016-Sep-23.0) TDB
Reference: JPL 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6610195405515311 4.3039e-08  
q 1.945471794302591 2.4086e-07 au
tp 2458417.991699009043
(2018-Oct-26.49169901)
3.4055e-05 TDB
node 21.4244335755487 7.7437e-06 deg
peri 56.71997160668946 1.0175e-05 deg
i 42.52322682845635 8.6989e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1707  
   data-arc span      36388 days (99.62 yr)  
   first obs. used      1920-10-31  
   last obs. used      2020-06-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .35414  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:23:35  

Additional Information
 Jupiter MOID = .330849 au 
 T_jup = 2.069 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.852383333187012E-15 -1.035980195874465E-14 7.494055302697334E-14 1.604085237187863E-14 -2.041024226670792E-13 -2.580215060572693E-14
q -1.035980195874465E-14 5.801252628283185E-14 -2.53743411151777E-13 -8.557543242899497E-14 1.159471878694694E-12 1.473781494063495E-13
tp 7.494055302697334E-14 -2.53743411151777E-13 1.159719846299137E-9 4.705250929010831E-14 1.718933401626243E-10 -8.980405046511594E-12
node 1.604085237187863E-14 -8.557543242899497E-14 4.705250929010831E-14 5.996428366777552E-11 -4.764811511234539E-11 -1.487077421349029E-11
peri -2.041024226670792E-13 1.159471878694694E-12 1.718933401626243E-10 -4.764811511234539E-11 1.03525013545833E-10 1.096926380235475E-11
i -2.580215060572693E-14 1.473781494063495E-13 -8.980405046511594E-12 -1.487077421349029E-11 1.096926380235475E-11 7.56701782562043E-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 10.7   n/a MPO492761  
diameter diameter 38. km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543 based on assumed dark albedo (0.06)
rotation period rot_per 10.063 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Tedesco, E.F.; Drummond, J.D. (1976) IAUC 3007.]
[Wisniewski, W.Z.; Michalowski, T.M.; Harris, A.W.; McMillan, R.S. (1997) Icarus 126, 395-449; 1995, Lunar & Planetary Sci. XXVI, 1511-1512.]
[Durech, J.; Kaasalainen, M.; Marciniak, A.; et al. (2007) Astron. Astrophys. 465, 331-337.]
[Collaborative Asteroid Lightcurve Link (CALL) (2011) http://www.minorplanetobserver.com/DATA/submissions_results.htm]
[Koff, R.A. (2011) http://www.antelopehillsobservatory.org]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
[Behrend, R. (2019) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.06   n/a DASTCOM value unverified
B-V BV 0.743   0.015 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=5.70, mean=13.30, max.=26.85) deg.
U-B UB 0.260   0.070 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=5.70, mean=13.30, max.=26.85) deg.
Tholen spectral type spec_T D   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices

944 Hidalgo (A920 UB)          Discovered 1920-Oct-31 by Baade, W. at Bergedorf
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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