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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6616964948944875 8.3562e-08  
a 5.736434203038252 5.7482e-08 AU
q 1.940655797694988 4.7148e-07 AU
i 42.528572372 2.1736e-05 deg
node 21.50352951941808 1.4252e-05 deg
peri 56.71259579760963 1.9603e-05 deg
M 244.0304283581103 6.4099e-06 deg
tp 2458417.101598855560
(2018-Oct-25.60159886)
0.00010733 JED
period 5018.35582686402
13.74
7.543e-05
2.065e-07
d
yr
n .07173664292054888 1.0783e-09 deg/d
Q 9.532212608381515 9.5518e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      631  
   data-arc span      32621 days (89.31 yr)  
   first obs. used      1920-10-31  
   last obs. used      2010-02-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .60551  
   data source      ORB  
   producer      Otto Matic  
   solution date      2013-Aug-05 13:35:44  

Additional Information
 Earth MOID = 1.14353 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-Sep-12) 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.]
[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 0.894365104214025 0.894361555905568 0.89436865251859 14.0628675207693 13.9953603562572 2423348.758479848 0.222177719118739 47.1565537635672 26.6028466114275 7.09682429382294 662273.072650674 T 33 CATAB v2.0c-linF95 2013-Aug-05 13:35:47 2013-Aug-05 13:35
1990-Aug-01 15:20 < 00:01 David 0.0237822888323403 0.0237790500226573 0.0237855276692061 15.2101132080045 15.210113166241 2448105.138946095 0.10105335060754 168.826226949767 93.6243044042101 20.5013832055577 23803.8701730417 T 33 CATAB v2.0c-linF95 2013-Aug-05 13:35:47 2013-Aug-05 13:35
1993-May-04 20:13 < 00:01 Jupiter 1.79697161410304 1.79696817127579 1.79697505693085 9.49046150846499 9.44066403621263 2449112.342320123 0.212149927726693 29.3804334549855 17.1067766262978 19.7207957112806 1591600.93785516 T 33 CATAB v2.0c-linF95 2013-Aug-05 13:35:47 2013-Aug-05 13:35
2076-May-09 16:59 < 00:01 Jupiter 1.90253735377111 1.90253304458875 1.90254166296998 9.36342154314736 9.31575275802499 2479433.207507908 0.264270368787078 29.0068232968201 19.2668363250661 -34.7904476631028 1811212.92491805 T 33 CATAB v2.0c-linF95 2013-Aug-05 13:35:47 2013-Aug-05 13:35
2171-Dec-09 18:46 < 00:01 Jupiter 1.2219464486073 1.22194386330682 1.22194903390568 14.8190508922915 14.7722009090758 2514344.281699858 0.249575070429033 37.4478062576141 28.4327613544338 -1.28618916965664 1179159.72674224 T 33 CATAB v2.0c-linF95 2013-Aug-05 13:35:47 2013-Aug-05 13:35
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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