Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
IMPORTANT: The SSD Announcement email list is now available. Major changes are coming in the near future, including possible hostname and/or URL changes. To be notified of such changes, subscribe to this email list.

Please visit this page for more details.


JPL Small-Body Database Browser
Search: [ help ]  
944 Hidalgo (A920 UB)
Classification: Centaur          SPK-ID: 2000944
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6607812761847529 4.8485e-08  
a 5.740957654526026 3.468e-08 au
q 1.947440329045693 2.7065e-07 au
i 42.52070388212712 9.1409e-06 deg
node 21.41995633041348 1.2351e-05 deg
peri 56.65085536069964 1.4354e-05 deg
M 13.07782368386697 2.9433e-06 deg
tp 2458417.981067836362
(2018-Oct-26.48106784)
4.0155e-05 TDB
period 5024.292815628552
13.76
4.5526e-05
1.246e-07
d
yr
n .07165187484299979 6.4925e-10 deg/d
Q 9.53447498000636 5.7595e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1287  
   data-arc span      35986 days (98.52 yr)  
   first obs. used      1920-10-31  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .37686  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:16:34  

Additional Information
 Earth MOID = 1.1504 au 
 Jupiter MOID = .328462 au 
 T_jup = 2.069 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456329.5 (2013-Feb-06.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6617486263557663 4.8428e-08  
q 1.940632509621079 2.7079e-07 au
tp 2458416.386667089298
(2018-Oct-24.88666709)
4.0003e-05 TDB
node 21.5746953369143 1.2358e-05 deg
peri 56.63878946387889 1.4349e-05 deg
i 42.54607212280995 9.1437e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1287  
   data-arc span      35986 days (98.52 yr)  
   first obs. used      1920-10-31  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .37686  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:16:34  

Additional Information
 Jupiter MOID = .328462 au 
 T_jup = 2.069 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.345289127376237E-15 -1.31066732432535E-14 4.356113426409777E-13 3.57249075032309E-15 -8.925344081237508E-14 -5.184249353224639E-14
q -1.31066732432535E-14 7.332631417689545E-14 -2.230899455375223E-12 -5.935321633255056E-15 5.2011023493121E-13 2.899950338102962E-13
tp 4.356113426409777E-13 -2.230899455375223E-12 1.600230057061874E-9 -2.578075919281072E-11 3.097168843228177E-10 -2.829420737757615E-11
node 3.57249075032309E-15 -5.935321633255056E-15 -2.578075919281072E-11 1.527083757181635E-10 -1.285491633024456E-10 -1.350476030707982E-11
peri -8.925344081237508E-14 5.2011023493121E-13 3.097168843228177E-10 -1.285491633024456E-10 2.058892441108297E-10 4.551265324038771E-12
i -5.184249353224639E-14 2.899950338102962E-13 -2.829420737757615E-11 -1.350476030707982E-11 4.551265324038771E-12 8.360763624451998E-11

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 10.7   n/a MPO492761  
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. 2019-January); 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.]
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

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Jan-20 23:48 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin