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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2341829092061512 1.9803e-08  
a 2.590442805975159 7.9028e-09 au
q 1.983805373539751 5.0517e-08 au
i 11.55331014083646 1.463e-06 deg
node 155.8958695221251 2.873e-06 deg
peri 270.6631788219736 3.7455e-06 deg
M 173.0622973590047 3.7174e-06 deg
tp 2458468.418549758456
(2018-Dec-15.91854976)
1.3836e-05 TDB
period 1522.858104329001
4.17
6.9688e-06
1.908e-08
d
yr
n .2363975993407623 1.0818e-09 deg/d
Q 3.197080238410567 9.7535e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2579  
   data-arc span      32537 days (89.08 yr)  
   first obs. used      1932-02-14  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44339  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 13:35:44  

Additional Information
 Earth MOID = 1.03605 au 
 Jupiter MOID = 2.25055 au 
 T_jup = 3.353 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456774.5 (2014-Apr-27.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2329594604202131 1.9755e-08  
q 1.987921172917617 5.0304e-08 au
tp 2456946.124105526360
(2014-Oct-15.62410553)
1.2344e-05 TDB
node 155.9163564778821 2.8718e-06 deg
peri 271.0047932643173 3.7661e-06 deg
i 11.55072406968827 1.463e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2579  
   data-arc span      32537 days (89.08 yr)  
   first obs. used      1932-02-14  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44339  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 13:35:44  

Additional Information
 Jupiter MOID = 2.25055 au 
 T_jup = 3.353 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.902742740520713E-16 -9.866851798328656E-16 9.81423380331833E-15 5.322407026618938E-15 -2.856403543486308E-14 -6.627014401789942E-15
q -9.866851798328656E-16 2.530520433869389E-15 -2.91415640306092E-14 -1.510595919434345E-14 7.347963877658657E-14 1.785682440422938E-14
tp 9.81423380331833E-15 -2.91415640306092E-14 1.523675218754184E-10 1.78090137101889E-11 2.89507254090948E-11 -1.213858578770302E-11
node 5.322407026618938E-15 -1.510595919434345E-14 1.78090137101889E-11 8.247224740691487E-12 -2.862083970568527E-12 -2.094666017754915E-12
peri -2.856403543486308E-14 7.347963877658657E-14 2.89507254090948E-11 -2.862083970568527E-12 1.418383377568787E-11 -1.238327767991252E-12
i -6.627014401789942E-15 1.785682440422938E-14 -1.213858578770302E-11 -2.094666017754915E-12 -1.238327767991252E-12 2.140439002566536E-12

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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