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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 47 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6605601702779734 3.9525e-08  
a 5.736008638556329 3.0886e-08 au
q 1.947029795555634 2.2056e-07 au
i 42.5287322319254 8.067e-06 deg
node 21.41635713710932 6.7066e-06 deg
peri 56.62369406968578 8.8998e-06 deg
M 41.79990618588545 2.404e-06 deg
tp 2458417.879276422718
(2018-Oct-26.37927642)
3.1079e-05 TDB
period 5017.797397800035
13.74
4.0528e-05
1.11e-07
d
yr
n .07174462646854488 5.7947e-10 deg/d
Q 9.524987481557023 5.1288e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1801  
   data-arc span      36416 days (99.70 yr)  
   first obs. used      1920-10-31  
   last obs. used      2020-07-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .35333  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:24:06  

Additional Information
 Earth MOID = 1.15023 au 
 Jupiter MOID = .330849 au 
 T_jup = 2.069 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457952.5 (2017-Jul-18.0) TDB
Reference: JPL 47 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6609132867672548 3.9427e-08  
q 1.946830144917989 2.2055e-07 au
tp 2458418.033205300272
(2018-Oct-26.53320530)
3.1066e-05 TDB
node 21.42173663027359 6.7073e-06 deg
peri 56.68665553157479 8.8971e-06 deg
i 42.52369403315972 8.0665e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1801  
   data-arc span      36416 days (99.70 yr)  
   first obs. used      1920-10-31  
   last obs. used      2020-07-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .35333  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:24:06  

Additional Information
 Jupiter MOID = .330849 au 
 T_jup = 2.069 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.554469988378376E-15 -8.689565446867441E-15 6.226475257914336E-14 9.552319116091914E-15 -1.71336387992138E-13 -2.614654226082519E-14
q -8.689565446867441E-15 4.864426293173533E-14 -2.102738261073252E-13 -4.991609356640549E-14 9.719685938345814E-13 1.488166091697759E-13
tp 6.226475257914336E-14 -2.102738261073252E-13 9.65084379668497E-10 3.624369932866387E-12 1.33395172110394E-10 -9.92732237293089E-12
node 9.552319116091914E-15 -4.991609356640549E-14 3.624369932866387E-12 4.498757688283503E-11 -3.458100944004865E-11 -1.125878041902907E-11
peri -1.71336387992138E-13 9.719685938345814E-13 1.33395172110394E-10 -3.458100944004865E-11 7.915768878798441E-11 8.687660491391906E-12
i -2.614654226082519E-14 1.488166091697759E-13 -9.92732237293089E-12 -1.125878041902907E-11 8.687660491391906E-12 6.506794180261345E-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. 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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