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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0895950459825693 4.0741e-08  
a 2.398130114741509 7.8045e-09 au
q 2.18326953683906 9.7255e-08 au
i 6.654584114089709 4.1716e-06 deg
node 4.448409113879186 2.9069e-05 deg
peri 192.269203566765 3.5162e-05 deg
M 99.73949852159953 2.0167e-05 deg
tp 2458624.686635150107
(2019-May-21.18663515)
7.5803e-05 TDB
period 1356.461716284471
3.71
6.6217e-06
1.813e-08
d
yr
n .2653963585393975 1.2956e-09 deg/d
Q 2.612990692643959 8.5037e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2371  
   data-arc span      28992 days (79.38 yr)  
   first obs. used      1941-03-18  
   last obs. used      2020-08-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44192  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:55:02  

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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