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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 ]

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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .201767517649077 1.8029e-08  
a 2.429323365252111 6.1834e-09 au
q 1.939164820278291 4.2833e-08 au
i 2.577859643639296 4.9248e-07 deg
node 330.5612268515787 2.1229e-05 deg
peri 1.721977484085541 2.1498e-05 deg
M 321.404694605468 5.8196e-06 deg
tp 2459544.771744974401
2.2754e-05 TDB
period 1383.01349465022
n .2603011477419084 9.9382e-10 deg/d
Q 2.919481910225932 7.431e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3481  
   data-arc span      41162 days (112.70 yr)  
   first obs. used      1908-11-28  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39539  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 07:45:40  

Additional Information
 Earth MOID = .92795 au 
 Jupiter MOID = 2.44411 au 
 T_jup = 3.479 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.16   n/a MPO614063 IRAS observations used: 11
diameter diameter 28.905 km 0.401 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
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] (  
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

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 ]
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