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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2339774838867356 1.9608e-08  
a 2.590982363919677 7.762e-09 au
q 1.984750829614845 5.0179e-08 au
i 11.55350890245607 1.4559e-06 deg
node 155.8918557372345 2.8663e-06 deg
peri 270.6191790096119 3.7113e-06 deg
M 219.4568190754832 3.8555e-06 deg
tp 2459991.206095887879
(2023-Feb-15.70609589)
1.8238e-05 TDB
period 1523.333918524461
4.17
6.8453e-06
1.874e-08
d
yr
n .2363237604193209 1.062e-09 deg/d
Q 3.19721389822451 9.5781e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2690  
   data-arc span      32643 days (89.37 yr)  
   first obs. used      1932-02-14  
   last obs. used      2021-06-29  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43862  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 13:34:03  

Additional Information
 Earth MOID = 1.03725 au 
 Jupiter MOID = 2.25134 au 
 T_jup = 3.353 
[ 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 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

Alternate Designations
 1932 CD1 = 1953 FR = 1976 QR1 = 1980 RF 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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