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996 Hilaritas (A923 FC)
Classification: Main-belt Asteroid          SPK-ID: 2000996
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 48 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1395915204384324 1.5637e-08  
a 3.088925973164678 1.0677e-08 au
q 2.657738100048856 4.6659e-08 au
i .6588299734971313 8.7406e-07 deg
node 347.3781402661771 4.8999e-05 deg
peri 146.7428671421828 5.083e-05 deg
M 60.28649241636883 6.7481e-06 deg
tp 2459064.431872442345
(2020-Aug-02.93187244)
3.6817e-05 TDB
period 1982.940475208295
5.43
1.0281e-05
2.815e-08
d
yr
n .1815485661324172 9.4128e-10 deg/d
Q 3.5201138462805 1.2167e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3803  
   data-arc span      38564 days (105.58 yr)  
   first obs. used      1915-11-27  
   last obs. used      2021-06-27  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43892  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 11:49:42  

Additional Information
 Earth MOID = 1.67256 au 
 Jupiter MOID = 1.51749 au 
 T_jup = 3.210 
[ show covariance matrix ]

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 11.21   n/a MPCxxxxx IRAS observations used: 15
diameter diameter 29.128 km 0.170 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 10.05 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Stephens, R.D. (2010) Minor Planet Bull. 37, 159-161.]
[Ferrero, A. (2011) Minor Planet Bull. 38, 49-50.]
[Strabla, L.; Quadri, U.; Girelli, R. (2011) Minor Planet Bull. 38, 14-15.]
[Chang, C.-K.; Lin, H.-W.; Ip, W.-H.; Prince, T.A.; et al. (2016) Astrophys. J. Sup. Ser. 227, A20.]
[Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.]
geometric albedo albedo 0.120   0.025 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.686   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=4.34 deg.
U-B UB 0.392   0.028 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=4.34 deg.
Tholen spectral type spec_T B   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo

996 Hilaritas (A923 FC)          Discovered 1923-Mar-21 by Palisa, J. at Vienna
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A923 FC = 1977 CG = A915 WH 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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