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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 ]

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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 50 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6605805444645868 3.9497e-08  
a 5.733840747812591 3.0768e-08 au
q 1.946177104749316 2.2029e-07 au
i 42.53944219081047 7.9404e-06 deg
node 21.41777407286246 6.5372e-06 deg
peri 56.59639809373448 8.7018e-06 deg
M 56.18210167153315 2.4245e-06 deg
tp 2458417.859446937643
(2018-Oct-26.35944694)
3.0438e-05 TDB
period 5014.952996057255
13.73
4.0366e-05
1.105e-07
d
yr
n .07178531888195784 5.7781e-10 deg/d
Q 9.521504390875865 5.1093e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1868  
   data-arc span      36667 days (100.39 yr)  
   first obs. used      1920-10-31  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .35539  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 19:01:21  

Additional Information
 Earth MOID = 1.14852 au 
 Jupiter MOID = .331587 au 
 T_jup = 2.069 
[ hide covariance matrix ]
Orbital Elements at Epoch 2458011.5 (2017-Sep-15.0) TDB
Reference: JPL 50 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6609133936179827 3.9388e-08  
q 1.946974520526732 2.203e-07 au
tp 2458418.029353838978
(2018-Oct-26.52935384)
3.0439e-05 TDB
node 21.42209523051903 6.539e-06 deg
peri 56.6810922720146 8.7008e-06 deg
i 42.52351895964392 7.9382e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1868  
   data-arc span      36667 days (100.39 yr)  
   first obs. used      1920-10-31  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .35539  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 19:01:21  

Additional Information
 Jupiter MOID = .331587 au 
 T_jup = 2.069 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.55139632258036E-15 -8.671178060411958E-15 6.782883266150285E-14 9.242216297405486E-15 -1.697337759764917E-13 -2.680814412147998E-14
q -8.671178060411958E-15 4.853400254142037E-14 -2.465439640545855E-13 -4.829945808028753E-14 9.620661820087494E-13 1.525002233260888E-13
tp 6.782883266150285E-14 -2.465439640545855E-13 9.265180663740705E-10 3.288935281436952E-12 1.254574664322556E-10 -9.69716844416549E-12
node 9.242216297405486E-15 -4.829945808028753E-14 3.288935281436952E-12 4.27582082874583E-11 -3.289027651491612E-11 -9.678588923458961E-12
peri -1.697337759764917E-13 9.620661820087494E-13 1.254574664322556E-10 -3.289027651491612E-11 7.570416229543859E-11 7.683061394430101E-12
i -2.680814412147998E-14 1.525002233260888E-13 -9.69716844416549E-12 -9.678588923458961E-12 7.683061394430101E-12 6.301558106824108E-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 10.69   n/a E2021B10  
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. 2020-October); 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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