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2640 Hallstrom (1941 FN)
Classification: Main-belt Asteroid          SPK-ID: 2002640
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08959501118132197 4.6487e-08  
a 2.398130118943791 8.2071e-09 au
q 2.183269624122758 1.1223e-07 au
i 6.654586720817893 4.4385e-06 deg
node 4.448422976631491 3.0072e-05 deg
peri 192.2691837015419 3.6165e-05 deg
M 99.73950073857853 2.0226e-05 deg
tp 2458624.686625808827
(2019-May-21.18662581)
7.6075e-05 TDB
period 1356.461719849896
3.71
6.9633e-06
1.906e-08
d
yr
n .26539635784181 1.3624e-09 deg/d
Q 2.612990613764825 8.9424e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2276  
   data-arc span      28945 days (79.25 yr)  
   first obs. used      1941-03-18  
   last obs. used      2020-06-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45128  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:48:08  

Additional Information
 Earth MOID = 1.18241 au 
 Jupiter MOID = 2.3466 au 
 T_jup = 3.513 
[ 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 13.0   n/a MPO384774  
rotation period rot_per 22.9 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Hasegawa, S.; Miyasaka, S.; Yoshizumi, C.; Sekiguchi, T.; et al. (2012) arXiv:1204.0548.]
SMASSII spectral type spec_B V   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

2640 Hallstrom (1941 FN)          Discovered 1941-Mar-18 by Oterma, L. at Turku
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1941 FN = 1967 ET = 1976 SG5 = 1978 EM6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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