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1493 Sigrid (1938 QB)
Classification: Main-belt Asteroid          SPK-ID: 2001493
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .201631392855791 3.1157e-08  
a 2.428937148095851 7.4208e-09 au
q 1.939187167766112 7.5212e-08 au
i 2.577865784505307 3.5752e-06 deg
node 330.5614500358038 6.8107e-05 deg
peri 1.749346569044936 6.8607e-05 deg
M 270.3397431918792 1.1158e-05 deg
tp 2459544.866042831171
(2021-Nov-26.36604283)
4.3888e-05 TDB
period 1382.683697689264
3.79
6.3365e-06
1.735e-08
d
yr
n .2603632346296052 1.1932e-09 deg/d
Q 2.91868712842559 8.9171e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3291  
   data-arc span      40956 days (112.13 yr)  
   first obs. used      1908-11-28  
   last obs. used      2021-01-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39877  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 19:04:37  

Additional Information
 Earth MOID = .926825 au 
 Jupiter MOID = 2.44534 au 
 T_jup = 3.479 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456582.5 (2013-Oct-17.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .202336615409667 3.1283e-08  
q 1.937818139862442 7.5656e-08 au
tp 2456775.897831692014
(2014-Apr-28.39783169)
3.6312e-05 TDB
node 330.6597673907312 6.7905e-05 deg
peri 1.153212499931334 6.8403e-05 deg
i 2.58360775158007 3.5779e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3291  
   data-arc span      40956 days (112.13 yr)  
   first obs. used      1908-11-28  
   last obs. used      2021-01-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39877  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 19:04:37  

Additional Information
 Jupiter MOID = 2.44534 au 
 T_jup = 3.479 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.786371825916425E-16 -2.359525353754369E-15 1.241196701606314E-13 2.501362856629815E-15 2.071155558416018E-14 -5.783903638323585E-17
q -2.359525353754369E-15 5.723782841972163E-15 -2.017257418709572E-13 -5.817957586464481E-15 -3.063249424129358E-14 1.962809075940129E-16
tp 1.241196701606314E-13 -2.017257418709572E-13 1.318566950800574E-9 8.031774832666164E-13 3.074149848432587E-10 8.132604635871536E-15
node 2.501362856629815E-15 -5.817957586464481E-15 8.031774832666164E-13 4.611080375698566E-9 -4.605872116320177E-9 9.33220946874867E-12
peri 2.071155558416018E-14 -3.063249424129358E-14 3.074149848432587E-10 -4.605872116320177E-9 4.678903269569542E-9 -9.325482626534403E-12
i -5.783903638323585E-17 1.962809075940129E-16 8.132604635871536E-15 9.33220946874867E-12 -9.325482626534403E-12 1.280109402994664E-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 12.17   n/a E2021B10 IRAS observations used: 11
diameter diameter 28.905 km 0.401 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 43.296 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:
[Bembrick, C.; Byron, J. (2007) Minor Planet Bull. 34, 1.]
[Hanus, J.; Broz, M.; Durech, J.; Warner, B.D.; et al. (2013) Astron. Astrophys. 559, A134.]
[Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.]
geometric albedo albedo 0.034   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.643   0.032 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=11.94, mean=20.72, max.=25.94) deg.
U-B UB 0.225   0.038 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=19.26, mean=23.65, max.=25.94) deg.
Tholen spectral type spec_T F   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Xc   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)

1493 Sigrid (1938 QB)          Discovered 1938-Aug-26 by Delporte, E. at Uccle
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1938 QB = 1934 NB1 = 1934 PW = 1957 UT = 1961 TM1 = 1961 XL = 1977 UN = A908 WA = A916 YD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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