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3924 Birch (1977 CU)
Classification: Main-belt Asteroid          SPK-ID: 2003924
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1101812032236364 2.9165e-08  
a 2.699382962196579 1.0281e-08 au
q 2.401961699460376 8.0893e-08 au
i 6.700395313177199 5.4075e-06 deg
node 331.5950392303151 2.8074e-05 deg
peri 96.2173307883276 3.8063e-05 deg
M 334.3429308087814 2.5425e-05 deg
tp 2459115.951538611451
(2020-Sep-23.45153861)
0.00011454 TDB
period 1619.926016894701
4.44
9.2542e-06
2.534e-08
d
yr
n .2222323712598295 1.2695e-09 deg/d
Q 2.996804224932782 1.1413e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2584  
   data-arc span      23947 days (65.56 yr)  
   first obs. used      1955-04-20  
   last obs. used      2020-11-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46596  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:14:50  

Additional Information
 Earth MOID = 1.42727 au 
 Jupiter MOID = 2.26675 au 
 T_jup = 3.350 
[ 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 12.4   n/a MPO502191  
diameter diameter 16.813 km 0.256 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 18.74 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:
[Behrend, R. (2008) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2015) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.080   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

3924 Birch (1977 CU)          Discovered 1977-Feb-11 by Bowell, E. at Palomar
on plates taken by C. Kowal.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1977 CU = 1968 DC = 1973 FC1 = 1975 TG = 1977 EB = 1978 LF = 1980 XH3 = 1984 SF5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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