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4398 Chiara (1984 HC2)
Classification: Main-belt Asteroid          SPK-ID: 2004398
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06552017730544209 2.612e-08  
a 2.365042113815169 7.0237e-09 au
q 2.210084135183162 6.1909e-08 au
i 4.970664878829598 3.5426e-06 deg
node 113.4673148706399 3.8605e-05 deg
peri 326.2961488289048 4.9912e-05 deg
M 142.4466254393218 3.1726e-05 deg
tp 2458674.838210518452
(2019-Jul-10.33821052)
0.00011705 TDB
period 1328.485273903294
3.64
5.918e-06
1.62e-08
d
yr
n .2709853146826872 1.2072e-09 deg/d
Q 2.520000092447177 7.4839e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3489  
   data-arc span      15946 days (43.66 yr)  
   first obs. used      1977-05-23  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40685  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 19:06:40  

Additional Information
 Earth MOID = 1.22749 au 
 Jupiter MOID = 2.60816 au 
 T_jup = 3.541 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.95   n/a E2021B10  
diameter diameter 6.871 km 0.199 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.34928 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.215   0.036 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

4398 Chiara (1984 HC2)          Discovered 1984-Apr-23 by Ferreri, W. at La Silla
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1984 HC2 = 1929 CB = 1977 KJ = 1980 DA3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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