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2290 Helffrich (1932 CD1)
Classification: Main-belt Asteroid          SPK-ID: 2002290
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2341829677536801 3.8936e-08  
a 2.590442840311047 8.3789e-09 au
q 1.983805248170734 9.9266e-08 au
i 11.55330719930294 3.6659e-06 deg
node 155.8957877013087 2.0305e-05 deg
peri 270.6632421991746 2.167e-05 deg
M 173.0623069925715 7.2463e-06 deg
tp 2458468.418494451486
(2018-Dec-15.91849445)
3.046e-05 TDB
period 1522.858134606847
4.17
7.3886e-06
2.023e-08
d
yr
n .2363975946406461 1.147e-09 deg/d
Q 3.197080432451361 1.0341e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2541  
   data-arc span      32323 days (88.50 yr)  
   first obs. used      1932-02-14  
   last obs. used      2020-08-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44069  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:10:54  

Additional Information
 Earth MOID = 1.03605 au 
 Jupiter MOID = 2.25055 au 
 T_jup = 3.353 
[ show covariance matrix ]

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 12.57   n/a E2021B10  
diameter diameter 17.333 km 4.372 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  
rotation period rot_per 95.883 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 0.049   0.019 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  

2290 Helffrich (1932 CD1)          Discovered 1932-Feb-14 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1932 CD1 = 1953 FR = 1976 QR1 = 1980 RF 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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