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1746 Brouwer (1963 RF)
Classification: Outer Main-belt Asteroid          SPK-ID: 2001746
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 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2085094680800158 3.865e-08  
a 3.952110943366818 2.2979e-08 au
q 3.128058392772193 1.5247e-07 au
i 8.366436156287438 4.5368e-06 deg
node 321.9455850106459 2.6757e-05 deg
peri 47.61181284631009 2.859e-05 deg
M 57.59678704148827 9.3501e-06 deg
tp 2458541.367669838333
(2019-Feb-26.86766984)
7.34e-05 TDB
period 2869.73713896818
7.86
2.5029e-05
6.853e-08
d
yr
n .1254470296639917 1.0941e-09 deg/d
Q 4.776163493961443 2.7771e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2678  
   data-arc span      29191 days (79.92 yr)  
   first obs. used      1940-11-29  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44294  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:15:53  

Additional Information
 Earth MOID = 2.13536 au 
 Jupiter MOID = .858646 au 
 T_jup = 3.003 
[ 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 9.9   n/a MPO502170 IRAS observations used: 2
diameter diameter 62.524 km 0.453 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)  
rotation period rot_per 19.8 h n/a LCDB (Rev. 2019-August); 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:
[Dahlgren, M.; Lahulla, J.F.; Lagerkvist, C.-I.; Lagerros, J.; et al. (1998) Icarus 133, 247-285.]
[Slyusarev, I.G.; Shevchenko, V.G.; Belskaya, I.N.; Krugly, Yu.N.; Chiorny, V.G. (2012) ACM 2012, #6398.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.048   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)  
B-V BV 0.721   0.023 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=11.87, mean=12.43, max.=12.99) deg.
U-B UB 0.227   0.035 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=11.87, mean=12.43, max.=12.99) deg.
Tholen spectral type spec_T D   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo

1746 Brouwer (1963 RF)          Discovered 1963-Sep-14 by Goethe Link Observatory at Brooklyn
Discovered by the Indiana Asteroid Program, Goethe Link Observatory, University of Indiana. This program was conceived and directed by F. K. Edmondson; the plates were blinked and measured astrometrically by B. Potter and, following her retirement, by D. Owings; and the photometry was performed under the direction of T. Gehrels. During the years 1947-1967, in which the plates were exposed, a large number of people participated in various aspects of the program.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1963 RF = 1940 WE = 1947 QA 
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