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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 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .661566644170509 8.6442e-08  
a 5.736509075001314 6.3572e-08 AU
q 1.941426016999024 4.91e-07 AU
i 42.52454215825346 2.2715e-05 deg
node 21.47615193106207 1.4564e-05 deg
peri 56.73259340977147 2.1296e-05 deg
M 258.3590317568439 7.5277e-06 deg
tp 2458417.390365077897
(2018-Oct-25.89036508)
0.00012343 JED
period 5018.454076586276
13.74
8.3421e-05
2.284e-07
d
yr
n .07173523848301992 1.1924e-09 deg/d
Q 9.531592133003604 1.0563e-07 AU
  Orbit Determination Parameters
   # obs. used (total)      634  
   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      .52836  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-09 17:25:14  

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 Asteroid Lightcurve DataBase (Rev. 2014-Mar-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.]
[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 0.894365935396784 0.894361995958451 0.894369874830331 14.0628696991203 13.9953626080049 2423348.758465318 0.247192716255557 52.5733201895289 27.9455197539298 8.24943991582461 599607.502867013 T 34 CATAB v2.0c-linF95 2014-Jun-09 17:25:19 2014-Jun-09 17:25
1993-May-04 20:13 < 00:01 Jupiter 1.79697166815272 1.79696809451057 1.79697524179613 9.49046285951003 9.44066539588592 2449112.342112902 0.217610150053214 31.8413297699167 17.7306260009707 23.6245688405903 1547653.64194414 T 34 CATAB v2.0c-linF95 2014-Jun-09 17:25:19 2014-Jun-09 17:25
2076-May-09 16:59 < 00:01 Jupiter 1.90253723034795 1.90253215735678 1.90254230335178 9.36342301663392 9.31575423595106 2479433.207298113 0.272932358753368 33.8507133922957 20.8956502261138 -34.4335207290728 1609670.72694468 T 34 CATAB v2.0c-linF95 2014-Jun-09 17:25:19 2014-Jun-09 17:25
2171-Dec-09 18:46 < 00:01 Jupiter 1.22194667021247 1.2219436810736 1.22194965934729 14.8190518700283 14.7722018984235 2514344.281634369 0.271182150360152 43.4328292246548 29.3826949785505 3.86191695229985 1019207.70705065 T 34 CATAB v2.0c-linF95 2014-Jun-09 17:25:19 2014-Jun-09 17:25
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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