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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 ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2014887797783611 3.1166e-08  
a 2.429255446623056 7.4585e-09 au
q 1.939787730913039 7.5223e-08 au
i 2.577808377843491 3.5763e-06 deg
node 330.5602767698844 6.8105e-05 deg
peri 1.724653874718813 6.8606e-05 deg
M 218.2911571726763 1.1014e-05 deg
tp 2459544.880619481778
(2021-Nov-26.38061948)
4.3932e-05 TDB
period 1382.955495954786
3.79
6.3691e-06
1.744e-08
d
yr
n .2603120643093852 1.1988e-09 deg/d
Q 2.918723162333074 8.9613e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3287  
   data-arc span      40769 days (111.62 yr)  
   first obs. used      1908-11-28  
   last obs. used      2020-07-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39872  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:18:26  

Additional Information
 Earth MOID = .929334 au 
 Jupiter MOID = 2.44505 au 
 T_jup = 3.479 
[ 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 12.1   n/a MPO502167 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. 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:
[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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