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891 Gunhild (A918 KB)
Classification: Main-belt Asteroid          SPK-ID: 2000891
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet 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. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet is not working, here are some notes that might help.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 87 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02873565658496703 3.5118e-08  
a 2.86216810488866 1.0318e-08 au
q 2.779921825138133 1.0058e-07 au
i 13.55872370151107 3.7518e-06 deg
node 105.8546521550878 1.6026e-05 deg
peri 292.3815816071003 6.7797e-05 deg
M 232.569122046998 6.7343e-05 deg
tp 2459626.556181501706
(2022-Feb-16.05618150)
0.00033231 TDB
period 1768.646884970351
4.84
9.5637e-06
2.618e-08
d
yr
n .2035454352472596 1.1006e-09 deg/d
Q 2.944414384639186 1.0614e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2784  
   data-arc span      37408 days (102.42 yr)  
   first obs. used      1918-05-18  
   last obs. used      2020-10-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .38709  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:24:43  

Additional Information
 Earth MOID = 1.81999 au 
 Jupiter MOID = 2.24689 au 
 T_jup = 3.259 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455669.5 (2011-Apr-18.0) TDB
Reference: JPL 87 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02919849846268964 3.5845e-08  
q 2.775421154716594 1.0206e-07 au
tp 2456131.787181760220
(2012-Jul-23.28718176)
0.0003118 TDB
node 105.9632968259757 1.6075e-05 deg
peri 300.4772248984164 6.5368e-05 deg
i 13.54157130252249 3.748e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2784  
   data-arc span      37408 days (102.42 yr)  
   first obs. used      1918-05-18  
   last obs. used      2020-10-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .38709  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:24:43  

Additional Information
 Jupiter MOID = 2.24689 au 
 T_jup = 3.259 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.284828548347078E-15 -3.640857505360752E-15 8.891463007395133E-13 -1.564867334759482E-15 1.679311694647883E-13 6.213814466212979E-17
q -3.640857505360752E-15 1.041710769458598E-14 -1.606085993246265E-12 4.618180171721465E-15 -2.966155976175795E-13 4.109580958091017E-16
tp 8.891463007395133E-13 -1.606085993246265E-12 9.722187289891874E-8 -8.76128586956966E-12 1.977285606454841E-8 -7.932335211463648E-12
node -1.564867334759482E-15 4.618180171721465E-15 -8.76128586956966E-12 2.584008445966127E-10 -2.527561052564226E-10 -8.846129583773992E-12
peri 1.679311694647883E-13 -2.966155976175795E-13 1.977285606454841E-8 -2.527561052564226E-10 4.273031546227001E-9 6.878531542721097E-12
i 6.213814466212979E-17 4.109580958091017E-16 -7.932335211463648E-12 -8.846129583773992E-12 6.878531542721097E-12 1.404769721513214E-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 10.0   n/a MPO347520  
diameter diameter 55.747 km 0.321 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 11.892 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Garceran, A.C.; Aznar, A.; Mansego, E.A.; Rodriguez, P.B.; et al. (2016) Minor Planet Bull. 43, 92-97.]
geometric albedo albedo 0.065   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  

891 Gunhild (A918 KB)          Discovered 1918-May-17 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1929-Nov-22 05:57 < 00:01 Pallas 0.0241004527125917 0.024092393937515 0.0241085115122356 10.3575820875754 10.3575817046387 2425937.747810484 0.671318959471228 403.48770817809 25.8821352831992 -5.47337580632182 15972.7547337933 T 87 CATAB v2.0f-lin.ifort 2020-Nov-13 04:24:51 2020-Nov-13 04:24

Alternate Designations
 A918 KB = 1977 FH = 1999 CF154 = A915 VE 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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