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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6615666476833431 8.6366e-08  
a 5.736509076170686 6.356e-08 AU
q 1.941425997243374 4.9057e-07 AU
i 42.52454205415148 2.2714e-05 deg
node 21.47615254191711 1.4544e-05 deg
peri 56.73259249823899 2.1273e-05 deg
M 258.3590317545884 7.527e-06 deg
tp 2458417.390365542583
(2018-Oct-25.89036554)
0.00012342 JED
period 5018.454078120773
13.74
8.3405e-05
2.284e-07
d
yr
n .07173523846108536 1.1922e-09 deg/d
Q 9.531592155097998 1.0561e-07 AU
  Orbit Determination Parameters
   # obs. used (total)      637  
   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      .52788  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jul-06 11:37:04  

Additional Information
 Earth MOID = 1.1451 AU 
 T_jup = 2.068 
[ 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 LCDB (Rev. 2015-May); 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 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 0.894365880905015 0.89436194514434 0.894369816660911 14.0628696074977 13.9953625118174 2423348.758464689 0.247120725933187 52.5317517756704 27.9233584817809 8.28782692739731 600219.456476872 T 35 CATAB v2.0c-linF95 2015-Jul-06 11:37:07 2015-Jul-06 11:37
1993-May-04 20:13 < 00:01 Jupiter 1.79697169204605 1.7969681188856 1.79697526520581 9.49046280970671 9.44066534648377 2449112.342117065 0.217309002719222 31.8397583190321 17.7076181802138 23.6139791989163 1548293.71816882 T 35 CATAB v2.0c-linF95 2015-Jul-06 11:37:07 2015-Jul-06 11:37
2076-May-09 16:59 < 00:01 Jupiter 1.90253719885734 1.90253212720807 1.90254227051927 9.36342303805927 9.31575425669502 2479433.207307348 0.272556789049849 33.8466624825658 20.8730709192468 -34.4547229062269 1611015.45418853 T 35 CATAB v2.0c-linF95 2015-Jul-06 11:37:07 2015-Jul-06 11:37
2171-Dec-09 18:46 < 00:01 Jupiter 1.22194665142782 1.22194366353425 1.22194963931881 14.8190518641133 14.7722018917684 2514344.281633960 0.271078770661156 43.4177165073394 29.3549783264036 3.86727005073594 1019575.97550164 T 35 CATAB v2.0c-linF95 2015-Jul-06 11:37:07 2015-Jul-06 11:37
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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