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2234 Schmadel (1977 HD)
Classification: Main-belt Asteroid          SPK-ID: 2002234
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 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .198905359850944 1.9197e-08  
a 2.700140331026248 1.3406e-08 au
q 2.163067946835425 5.6529e-08 au
i 25.23903694690998 6.4154e-07 deg
node 6.07642969112603 3.0724e-06 deg
peri 272.2334009114269 7.7254e-06 deg
M 282.6608759963363 1.2637e-05 deg
tp 2459548.656636820685
(2021-Nov-30.15663682)
5.8353e-05 TDB
period 1620.60782133386
4.44
1.2069e-05
3.304e-08
d
yr
n .2221388760815049 1.6543e-09 deg/d
Q 3.23721271521707 1.6072e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2329  
   data-arc span      17870 days (48.93 yr)  
   first obs. used      1972-04-12  
   last obs. used      2021-03-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .3757  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 13:30:38  

Additional Information
 Earth MOID = 1.31279 au 
 Jupiter MOID = 2.28133 au 
 T_jup = 3.204 
[ 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 12.35   n/a E2021B10  
diameter diameter 9.473 km 0.046 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 15.63 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:
[Moravec, P.; Cochren, J.; Gerhardt, M.; Harris, A.; et al. (2012) Minor Planet Bull. 39, 213-216.]
geometric albedo albedo 0.284   0.016 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
SMASSII spectral type spec_B A   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)

2234 Schmadel           Discovered 1977 Apr. 27 by H.-E. Schuster at the European Southern Observatory.
Named in honor of Lutz D. Schmadel, Astronomisches Rechen-Institut, computer of orbits and ephemerides of minor planets, and Editor of "Astronomy and Astrophysics Abstracts". The lost objects (1206) Numerowia and (1370) Hella were recovered as the result of his calculations.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC 5285Last Updated: 2007-10-23

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Alternate Designations
 1977 HD = 1972 GF1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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