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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 
[ 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 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

[ 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
1922-Oct-21 06:13 < 00:01 Jupiter 0.894368181186983 0.894365398567422 0.894370963806645 14.0628726549304 13.995365747994 2423348.758794831 0.568633244209704 139.459520135875 49.0216406477968 6.9481052713396 884180.31982871 T 47 CATAB v2.0f-lin.ifort 2020-Nov-13 04:24:11 2020-Nov-13 04:24
1993-May-04 20:13 < 00:01 Jupiter 1.79697220863487 1.79697016321881 1.79697425405102 9.4904615145902 9.4406640588892 2449112.342039089 0.374218557784977 107.892947935612 68.6775115468912 24.4730997999746 3572148.1463714 T 47 CATAB v2.0f-lin.ifort 2020-Nov-13 04:24:11 2020-Nov-13 04:24
2076-May-09 16:58 < 00:01 Jupiter 1.90253838199671 1.90253546702116 1.90254129697247 9.36342092876918 9.3157521663315 2479433.207189288 0.424823513213496 151.159934250262 69.6302562926476 17.3703613507746 3047189.28007399 T 47 CATAB v2.0f-lin.ifort 2020-Nov-13 04:24:11 2020-Nov-13 04:24
2171-Dec-09 18:46 < 00:01 Jupiter 1.22194883789018 1.22194642855273 1.22195124722763 14.8190549733582 14.772205094837 2514344.281959783 0.59681279568014 120.019384563801 48.4237919471253 1.05245382924499 1293669.30955344 T 47 CATAB v2.0f-lin.ifort 2020-Nov-13 04:24:11 2020-Nov-13 04:24
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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