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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 
[ 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 10.69   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

[ 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 0.894370273976224 0.894367523914048 0.894373024038452 14.0628768802988 13.9953701524616 2423348.759019867 0.55937057352876 137.962225696316 48.1151506654827 7.44357997877797 901190.039468394 T 50 CATAB v2.0g-lin.ifort 2021-May-03 19:01:44 2021-May-03 19:01
1993-May-04 20:13 < 00:01 Jupiter 1.79697229104814 1.79697027327691 1.79697430881958 9.49046080944487 9.44066335259005 2449112.342069850 0.364518032868308 105.956013693441 67.3148328689985 23.3875032391734 3592140.2922751 T 50 CATAB v2.0g-lin.ifort 2021-May-03 19:01:44 2021-May-03 19:01
2076-May-09 16:58 < 00:01 Jupiter 1.9025379271937 1.90253502577223 1.90254082861549 9.36342087187372 9.31575209798451 2479433.207285590 0.415213515405381 150.314353557836 67.8034759510336 17.0495415688323 3063698.59994789 T 50 CATAB v2.0g-lin.ifort 2021-May-03 19:01:44 2021-May-03 19:01
2171-Dec-09 18:46 < 00:01 Jupiter 1.22194832894182 1.22194596346127 1.22195069442237 14.8190534867891 14.7722035842683 2514344.281993206 0.583333098328492 117.850872571624 47.6192932668587 1.47955653616138 1318624.48101783 T 50 CATAB v2.0g-lin.ifort 2021-May-03 19:01:44 2021-May-03 19:01
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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