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JPL Small-Body Database Browser
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1542 Schalen (1941 QE)
Classification: Main-belt Asteroid          SPK-ID: 2001542
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1166241298780712 1.7702e-08  
a 3.093002229819513 1.2554e-08 au
q 2.732283536055878 5.7832e-08 au
i 2.766342760691667 7.5392e-07 deg
node 211.6418652564647 7.527e-06 deg
peri 163.7882404719211 1.1962e-05 deg
M 142.609648100164 1.1924e-05 deg
tp 2458213.426692815425
(2018-Apr-04.92669282)
6.3263e-05 TDB
period 1986.866908103122
5.44
1.2097e-05
3.312e-08
d
yr
n .1811897910885712 1.1032e-09 deg/d
Q 3.453720923583148 1.4018e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3086  
   data-arc span      9815 days (26.87 yr)  
   first obs. used      1993-02-19  
   last obs. used      2020-01-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .34167  
   source      ORB  
   producer      Giorgini  
   solution date      2020-Feb-14 15:15:52  

Additional Information
 Earth MOID = 1.73356 au 
 Jupiter MOID = 2.01269 au 
 T_jup = 3.212 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455991.5 (2012-Mar-05.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1110063459093505 1.7707e-08  
q 2.750700967410772 5.7274e-08 au
tp 2456227.727147334368
(2012-Oct-27.22714733)
6.0463e-05 TDB
node 212.0106004511319 7.5329e-06 deg
peri 164.2184046519266 1.2255e-05 deg
i 2.765055710901614 7.5262e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3086  
   data-arc span      9815 days (26.87 yr)  
   first obs. used      1993-02-19  
   last obs. used      2020-01-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .34167  
   source      ORB  
   producer      Giorgini  
   solution date      2020-Feb-14 15:15:52  

Additional Information
 Jupiter MOID = 2.01269 au 
 T_jup = 3.212 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.135385948566798E-16 -9.956823784930668E-16 -8.086029640098642E-14 -4.426583377931806E-14 2.455734987188081E-14 5.936053420758886E-15
q -9.956823784930668E-16 3.280310230773067E-15 4.700202493541247E-13 1.342378214984604E-13 -3.150592471991438E-14 -1.824124795236796E-14
tp -8.086029640098642E-14 4.700202493541247E-13 3.655741717592385E-9 -2.022916514305216E-11 5.833785917316348E-10 2.94768505551286E-12
node -4.426583377931806E-14 1.342378214984604E-13 -2.022916514305216E-11 5.674409854812661E-11 -5.954268556433692E-11 -4.430314024344489E-12
peri 2.455734987188081E-14 -3.150592471991438E-14 5.833785917316348E-10 -5.954268556433692E-11 1.501898045785573E-10 4.943163222349152E-12
i 5.936053420758886E-15 -1.824124795236796E-14 2.94768505551286E-12 -4.430314024344489E-12 4.943163222349152E-12 5.664295308063695E-13

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.6   n/a MPO384761  
diameter diameter 42.374 km 0.273 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 7.516 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Li, B.; Zhao, H.; Han, X.L.; Klinglesmith III, D.A.; Hanowell, J. (2013) Minor Planet Bull. 40, 68-69.]
[Durech, J.; Hanus, J. (2018) Astron. Astrophys. 620, A91.]
geometric albedo albedo 0.068   0.003 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
SMASSII spectral type spec_B D   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)

1542 Schalen (1941 QE)          Discovered 1941-Aug-26 by Vaisala, Y. at Turku
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1941 QE = 1927 BH = 1936 UL = 1940 LP = 1976 CA = A898 VD = A924 NA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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