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944 Hidalgo (1920 HZ)
Classification: Centaur          SPK-ID: 2000944
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6617809124726803 8.474e-08  
a 5.737011459534766 5.8566e-08 AU
q 1.940366780977625 4.7796e-07 AU
i 42.54308634439113 2.1939e-05 deg
node 21.56492602879133 1.4326e-05 deg
peri 56.65082234879021 1.9627e-05 deg
M 215.4034237231372 6.1471e-06 deg
tp 2458416.462791611913
(2018-Oct-24.96279161)
0.00010815 JED
period 5019.113340489356
13.74
7.6857e-05
2.104e-07
d
yr
n .07172581601133966 1.0983e-09 deg/d
Q 9.533656138091906 9.7324e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      628  
   data-arc span      32621 days (89.31 yr)  
   first obs. used      1920-10-31  
   last obs. used      2010-02-22  
   planetary ephem.      DE405  
   SB-pert. ephem.      SB405-CPV-2  
   condition code      0  
   fit RMS      .59425  
   data source      ORB  
   producer      Otto Matic  
   solution date      2011-Sep-14 18:50:13  

Additional Information
 Earth MOID = 1.1433 AU 
 T_jup = 2.067 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.77 mag n/a PDS3 (MPC 17260)  
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 Asteroid Lightcurve DataBase (Rev. 2013-May-01) 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 Science XXVI, 1511-1512.]
[Wisniewski, W.Z.; Michalowski, T.M.; Harris, A.W.; McMillan, R.S. (1997) Icarus 126, 395-449; 1995, Lunar & Planetary Science 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/submi ssions_results.htm]
[Koff, R.A. (2011) http://www.antelopehillsobservatory.org]
geometric albedo albedo 0.06   n/a DASTCOM value unverified
B-V BV .743 mag .015 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=3; phase (min.=5.70, mean=13.30, max.=26.85) deg.
U-B UB .260 mag .070 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #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 (1920 HZ)          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 06:12 < 00:01 Jupiter 0.894362401261266 0.89435882889264 0.894365973625969 14.0628615991373 13.9953541999118 2423348.758560195 0.222871442932382 47.5064908970301 26.8389421192671 7.72380732075536 659238.77179829 T 31 CATAB v2.0c-linF95 2011-Sep-15 07:48:56 2011-Sep-15 12:49
1993-May-04 20:12 < 00:01 Jupiter 1.7969715548467 1.79696803898956 1.79697507070338 9.49046196732331 9.44066449463703 2449112.342361708 0.213323206321758 29.784370604471 17.1956112447374 19.0210442683737 1563870.09211669 T 31 CATAB v2.0c-linF95 2011-Sep-15 07:48:56 2011-Sep-15 12:49
2076-May-09 16:58 < 00:01 Jupiter 1.90253861953372 1.90253425100173 1.90254298806392 9.36342046321888 9.31575170320963 2479433.207146294 0.266149383118051 29.3984611310672 19.289310168704 -34.5101794034875 1794798.8631761 T 31 CATAB v2.0c-linF95 2011-Sep-15 07:48:56 2011-Sep-15 12:49
2171-Dec-09 18:44 < 00:01 Jupiter 1.22194761709713 1.2219450293645 1.22195020482766 14.8190534738125 14.7722035425204 2514344.281170582 0.250443725058858 37.4684786384271 28.6725597878376 -1.08083937503127 1178440.83137196 T 31 CATAB v2.0c-linF95 2011-Sep-15 07:48:56 2011-Sep-15 12:49
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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