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2145 Blaauw (1976 UF)
Classification: Outer Main-belt Asteroid          SPK-ID: 2002145
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1007016726583951 4.4761e-08  
a 3.214078394357851 2.0019e-08 au
q 2.890415323990807 1.4043e-07 au
i 15.01182036634328 3.7608e-06 deg
node 264.2718652232002 1.9083e-05 deg
peri 278.2083986296094 2.8573e-05 deg
M 159.7346750441512 2.325e-05 deg
tp 2458266.644186360875
(2018-May-28.14418636)		 0.00013335 TDB
period 2104.665707788003
5.76		 1.9663e-05
5.383e-08		 d
yr
n .1710485416604991 1.5981e-09 deg/d
Q 3.537741464724895 2.2035e-08 au
   Orbit Determination Parameters
   # obs. used (total)      2724  
   data-arc span      16158 days (44.24 yr)  
   first obs. used      1976-10-24  
   last obs. used      2021-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .35646  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 01:00:40  

Additional Information
 Earth MOID = 1.94019 au 
 Jupiter MOID = 1.72666 au 
 T_jup = 3.129 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457404.5 (2016-Jan-17.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09636241646980208 4.4795e-08  
q 2.907996684706443 1.3953e-07 au
tp 2458267.458754534934
(2018-May-28.95875453)		 0.0001382 TDB
node 264.3462568422353 1.9067e-05 deg
peri 278.7321239198215 2.9093e-05 deg
i 15.00880369368107 3.7523e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      2724  
   data-arc span      16158 days (44.24 yr)  
   first obs. used      1976-10-24  
   last obs. used      2021-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .35646  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 01:00:40  

Additional Information
 Jupiter MOID = 1.72666 au 
 T_jup = 3.129 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.00657013460469E-15 -6.201940339326612E-15 -1.973442906438237E-12 -7.259553849997419E-16 -3.596881193258749E-13 3.801478979648414E-15
q -6.201940339326612E-15 1.946764271446146E-14 6.895174819202722E-12 7.017734212905284E-16 1.217291522216055E-12 -1.05165779228352E-14
tp -1.973442906438237E-12 6.895174819202722E-12 1.909976296233537E-8 -1.2956701170047E-12 3.080082837987048E-9 -4.483584917806881E-12
node -7.259553849997419E-16 7.017734212905284E-16 -1.2956701170047E-12 3.635347000849074E-10 -3.511236552489359E-10 2.585184052924396E-11
peri -3.596881193258749E-13 1.217291522216055E-12 3.080082837987048E-9 -3.511236552489359E-10 8.464051223383222E-10 -2.583068107126338E-11
i 3.801478979648414E-15 -1.05165779228352E-14 -4.483584917806881E-12 2.585184052924396E-11 -2.583068107126338E-11 1.408009297395068E-11

[ 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 11.06   n/a E2021B10  
diameter diameter 40.549 km 0.848 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 12.141 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 0.051   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

2145 Blaauw (1976 UF)          Discovered 1976-Oct-24 by West, R. M. at La Silla
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1976 UF = 1929 XS = 1963 RK = 1980 TW 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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