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39977 (1998 HR9)
Classification: Main-belt Asteroid          SPK-ID: 2039977
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2410610780755837 3.5988e-08  
a 2.628249127839873 1.3897e-08 au
q 1.99468055963158 9.3791e-08 au
i 14.57474503441278 4.5727e-06 deg
node 87.9986298665977 2.0036e-05 deg
peri 242.7884016620623 2.3251e-05 deg
M 346.8036196328478 1.4096e-05 deg
tp 2459057.549329501623
(2020-Jul-27.04932950)
6.1177e-05 TDB
period 1556.317569604618
4.26
1.2344e-05
3.38e-08
d
yr
n .2313152579081003 1.8347e-09 deg/d
Q 3.261817696048165 1.7248e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1349  
   data-arc span      8096 days (22.17 yr)  
   first obs. used      1998-04-18  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48284  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 21:04:34  

Additional Information
 Earth MOID = 1.02856 au 
 Jupiter MOID = 2.20304 au 
 T_jup = 3.315 
[ 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 14.0   n/a MPO344604  
diameter diameter 4.033 km 1.031 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.328   0.168 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

39977 (1998 HR9)          Discovered 1998-Apr-18 by Spacewatch at Kitt Peak
Reference: 20020526/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1998 HR9 = 2000 AS100 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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