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2117 Danmark (1978 AC)
Classification: Main-belt Asteroid          SPK-ID: 2002117
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06718802160245101 3.2769e-08  
a 2.87147685607183 1.2853e-08 au
q 2.678548007035138 9.4041e-08 au
i 2.931988789413361 3.7211e-06 deg
node 59.49412619121559 7.1658e-05 deg
peri 264.8903285685373 7.7105e-05 deg
M 141.4024364481041 2.881e-05 deg
tp 2458302.410992933538
(2018-Jul-02.91099293)
0.00014244 TDB
period 1777.282265119668
4.87
1.1933e-05
3.267e-08
d
yr
n .2025564577249413 1.36e-09 deg/d
Q 3.064405705108522 1.3717e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2952  
   data-arc span      30688 days (84.02 yr)  
   first obs. used      1936-11-09  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42867  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:04:27  

Additional Information
 Earth MOID = 1.66835 au 
 Jupiter MOID = 2.14975 au 
 T_jup = 3.293 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456645.5 (2013-Dec-19.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06905304974823501 3.306e-08  
q 2.67163098677134 9.5028e-08 au
tp 2456513.720546554894
(2013-Aug-09.22054655)
0.00013829 TDB
node 59.60151345512091 7.1767e-05 deg
peri 262.4415249540345 7.6835e-05 deg
i 2.931513895751058 3.7173e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2952  
   data-arc span      30688 days (84.02 yr)  
   first obs. used      1936-11-09  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42867  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:04:27  

Additional Information
 Jupiter MOID = 2.14975 au 
 T_jup = 3.293 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.092943170232576E-15 -3.11714873027158E-15 2.411024651115874E-13 -1.045485487677525E-15 3.692976515406888E-14 -1.362980936938669E-16
q -3.11714873027158E-15 9.030383319483737E-15 -8.771518334450369E-13 2.266534071344011E-15 -1.417100003771105E-13 5.294043116366201E-16
tp 2.411024651115874E-13 -8.771518334450369E-13 1.912441179144585E-8 1.572515151762198E-11 3.812095831098266E-9 -7.622988389741364E-14
node -1.045485487677525E-15 2.266534071344011E-15 1.572515151762198E-11 5.150507205619198E-9 -5.140330816369709E-9 -1.308618742983354E-11
peri 3.692976515406888E-14 -1.417100003771105E-13 3.812095831098266E-9 -5.140330816369709E-9 5.903580024879504E-9 1.304991241248662E-11
i -1.362980936938669E-16 5.294043116366201E-16 -7.622988389741364E-14 -1.308618742983354E-11 1.304991241248662E-11 1.381854962947878E-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 11.8   n/a MPO319109  
diameter diameter 11.977 km 0.248 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 16.598 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Yankov, A.; Ditteon, R. (2009) Minor Planet Bull. 36, 3-4.]
geometric albedo albedo 0.196   0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

2117 Danmark (1978 AC)          Discovered 1978-Jan-09 by West, R. M. at La Silla
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1978 AC = 1936 VJ = 1949 KY = 1951 YJ1 = 1969 OE1 = 1975 VW8 = 1977 EG 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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