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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1397164932869588 1.565e-08  
a 3.08969081863596 1.1107e-08 au
q 2.65801005211523 4.6943e-08 au
i .658883594666287 8.817e-07 deg
node 347.37998058 4.9402e-05 deg
peri 146.8198435178194 5.1215e-05 deg
M 24.6337813826393 6.7535e-06 deg
tp 2459064.762594918093
(2020-Aug-03.26259492)
3.7056e-05 TDB
period 1983.677011273818
5.43
1.0697e-05
2.929e-08
d
yr
n .1814811574434822 9.786e-10 deg/d
Q 3.521371585156689 1.2659e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3501  
   data-arc span      38468 days (105.32 yr)  
   first obs. used      1915-11-27  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4493  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 19:04:57  

Additional Information
 Earth MOID = 1.67211 au 
 Jupiter MOID = 1.51637 au 
 T_jup = 3.210 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456397.5 (2013-Apr-15.0) TDB
Reference: JPL 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1402375029632354 1.5394e-08  
q 2.654523323068695 4.5919e-08 au
tp 2457087.631692411751
(2015-Mar-06.13169241)
3.6724e-05 TDB
node 347.41660791422 4.927e-05 deg
peri 147.9667722175867 5.105e-05 deg
i .6607987319792897 8.8201e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3501  
   data-arc span      38468 days (105.32 yr)  
   first obs. used      1915-11-27  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4493  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 19:04:57  

Additional Information
 Jupiter MOID = 1.51637 au 
 T_jup = 3.210 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.369801237669742E-16 -6.927411941282121E-16 -3.876587783913225E-13 -1.737839282992827E-13 8.204658174453113E-14 3.216241724309559E-15
q -6.927411941282121E-16 2.108554128755057E-15 1.157040923790897E-12 5.520395344982587E-13 -2.783910701260219E-13 -1.021361866058735E-14
tp -3.876587783913225E-13 1.157040923790897E-12 1.348659658796851E-9 -2.338729974269434E-10 5.489208257035681E-10 2.393172705167474E-12
node -1.737839282992827E-13 5.520395344982587E-13 -2.338729974269434E-10 2.427548466229763E-9 -2.479868722681263E-9 -3.897545219552532E-11
peri 8.204658174453113E-14 -2.783910701260219E-13 5.489208257035681E-10 -2.479868722681263E-9 2.606148814343449E-9 3.957847661920645E-11
i 3.216241724309559E-15 -1.021361866058735E-14 2.393172705167474E-12 -3.897545219552532E-11 3.957847661920645E-11 7.779444473653361E-13

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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