Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 ]

[ hide orbit diagram ]

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 .201631440303416 1.9949e-08  
a 2.428937141280862 6.7765e-09 au
q 1.93918704707794 4.6655e-08 au
i 2.577865894428018 4.9342e-07 deg
node 330.5612319927945 2.1253e-05 deg
peri 1.749555995028799 2.1597e-05 deg
M 270.3397560113666 6.3737e-06 deg
tp 2459544.865992144930
(2021-Nov-26.36599214)
2.556e-05 TDB
period 1382.683691870068
3.79
5.7863e-06
1.584e-08
d
yr
n .2603632357253763 1.0896e-09 deg/d
Q 2.918687235483784 8.1429e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3366  
   data-arc span      41016 days (112.30 yr)  
   first obs. used      1908-11-28  
   last obs. used      2021-03-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39962  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:32:00  

Additional Information
 Earth MOID = .926825 au 
 Jupiter MOID = 2.44534 au 
 T_jup = 3.479 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456648.5 (2013-Dec-22.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2023006430152117 2.0012e-08  
q 1.937860784987207 4.6873e-08 au
tp 2456775.894719040693
(2014-Apr-28.39471904)
1.8226e-05 TDB
node 330.6572510480707 2.1193e-05 deg
peri 1.152597090019644 2.1538e-05 deg
i 2.583667979576316 4.9459e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3366  
   data-arc span      41016 days (112.30 yr)  
   first obs. used      1908-11-28  
   last obs. used      2021-03-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39962  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:32:00  

Additional Information
 Jupiter MOID = 2.44534 au 
 T_jup = 3.479 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.004929125310947E-16 -9.326728524200897E-16 2.769591811630925E-13 -1.71997928815358E-14 5.65747769048084E-14 1.302892137891618E-15
q -9.326728524200897E-16 2.197041743055252E-15 -6.308597481570562E-13 3.625687847464314E-14 -1.231632417128979E-13 -2.998188273586547E-15
tp 2.769591811630925E-13 -6.308597481570562E-13 3.321851575196763E-10 -1.905686133206242E-11 8.315709285345979E-11 1.10037706306747E-12
node -1.71997928815358E-14 3.625687847464314E-14 -1.905686133206242E-11 4.491226675667463E-10 -4.494755292973401E-10 -5.524957775200295E-12
peri 5.65747769048084E-14 -1.231632417128979E-13 8.315709285345979E-11 -4.494755292973401E-10 4.638915251772961E-10 5.711043028147862E-12
i 1.302892137891618E-15 -2.998188273586547E-15 1.10037706306747E-12 -5.524957775200295E-12 5.711043028147862E-12 2.446156996300082E-13

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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Apr-14 09:08 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin