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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 
[ 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. 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

[ 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 0.894367799407874 0.894364775513258 0.89437082330249 14.0628718478772 13.9953649081617 2423348.758790120 0.626607216165357 151.088857100681 55.5342441956974 5.07134352736256 796334.292280637 T 46 CATAB v2.0f-lin.ifort 2020-Jun-23 15:23:47 2020-Jun-23 15:23
1993-May-04 20:13 < 00:01 Jupiter 1.79697219120938 1.79696994863473 1.79697443378433 9.4904612787151 9.44066382128574 2449112.342105954 0.430940567962038 119.972058809378 76.8453183328163 27.6653658989672 3283965.90367453 T 46 CATAB v2.0f-lin.ifort 2020-Jun-23 15:23:47 2020-Jun-23 15:23
2076-May-09 16:58 < 00:01 Jupiter 1.90253824145513 1.90253517466172 1.90254130824896 9.36342086551898 9.31575209922732 2479433.207267604 0.485260630589728 160.237172783572 78.7335537391092 19.4443789091859 2912964.44437137 T 46 CATAB v2.0f-lin.ifort 2020-Jun-23 15:23:47 2020-Jun-23 15:23
2171-Dec-09 18:46 < 00:01 Jupiter 1.22194864132216 1.22194596134773 1.22195132129659 14.8190545102212 14.7722046226827 2514344.281969829 0.671256005785538 133.48469776111 55.0137601898254 -0.411331520927933 1162028.72001314 T 46 CATAB v2.0f-lin.ifort 2020-Jun-23 15:23:47 2020-Jun-23 15:23
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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