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1811 Bruwer (4576 P-L)
Classification: Main-belt Asteroid          SPK-ID: 2001811
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1102518736069067 1.3629e-08  
a 3.14053875257098 1.1156e-08 au
q 2.794288470964932 4.4017e-08 au
i 8.525281059446177 6.7604e-07 deg
node 167.7810136258462 1.9327e-06 deg
peri 137.0038852237911 1.2418e-05 deg
M 14.36788465566956 9.334e-06 deg
tp 2459315.367474665316
(2021-Apr-10.86747467)
5.2673e-05 TDB
period 2032.846853970317
5.57
1.0832e-05
2.966e-08
d
yr
n .1770915498611665 9.4362e-10 deg/d
Q 3.486789034177028 1.2386e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3327  
   data-arc span      32954 days (90.22 yr)  
   first obs. used      1931-05-19  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42488  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 08:05:37  

Additional Information
 Earth MOID = 1.78664 au 
 Jupiter MOID = 1.823 au 
 T_jup = 3.184 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457159.5 (2015-May-17.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1077123265792172 1.3759e-08  
q 2.799495906093596 4.416e-08 au
tp 2457290.814141826783
(2015-Sep-25.31414183)
5.4587e-05 TDB
node 167.8649338660944 1.9363e-06 deg
peri 137.8342621708056 1.2698e-05 deg
i 8.51755054245481 6.7551e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3327  
   data-arc span      32954 days (90.22 yr)  
   first obs. used      1931-05-19  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42488  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 08:05:37  

Additional Information
 Jupiter MOID = 1.823 au 
 T_jup = 3.184 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.89307048814723E-16 -5.921161229750306E-16 1.321018096922994E-13 -3.434341537123949E-16 3.269031985634601E-14 2.421547673022271E-15
q -5.921161229750306E-16 1.950090322974438E-15 -4.893311576498365E-13 1.767355168163577E-15 -1.199720289849978E-13 -8.122361542255944E-15
tp 1.321018096922994E-13 -4.893311576498365E-13 2.979754771385789E-9 -3.820175554062806E-11 6.844451533020252E-10 1.364748893238829E-11
node -3.434341537123949E-16 1.767355168163577E-15 -3.820175554062806E-11 3.749240216886689E-12 -1.211246721549371E-11 -1.141516720698238E-12
peri 3.269031985634601E-14 -1.199720289849978E-13 6.844451533020252E-10 -1.211246721549371E-11 1.612432340202068E-10 4.273387904416234E-12
i 2.421547673022271E-15 -8.122361542255944E-15 1.364748893238829E-11 -1.141516720698238E-12 4.273387904416234E-12 4.563072386637094E-13

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 11.01   n/a E2021B10  
diameter diameter 28.072 km 0.103 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 17.565 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Brinsfield, J.W. (2011) Minor Planet Bull. 38, 73-74.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.074   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

1811 Bruwer (4576 P-L)          Discovered 1960-Sep-24 by PLS at Palomar
These planets have all been discovered as a result of the Palomar survey of faint minor planets and subsequently identified with planets observed at other oppositions. In Sept. and Oct. 1960, T. Gehrels exposed 130 plates with the 122 cm Schmidt camera at Palomar. In the following years C. J. van Houten and I. van Houten-Groeneveld measured these plates astrometrically and photometrically at Leiden. P. Herget, Cincinnati, computed the orbits of the planets found on the NORC computer, Dahlgren, Virginia, USA.
Note: "planet" implies "minor planet"
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 4576 P-L = 1931 KM = 1948 MJ = 1965 RA = 1970 KJ 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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