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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 49 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0672652040633418 1.7146e-08  
a 2.871395072339913 1.1481e-08 au
q 2.678250096852495 5.0853e-08 au
i 2.931844330945562 9.0661e-07 deg
node 59.48698364568712 6.3398e-06 deg
peri 264.9989563320025 1.7496e-05 deg
M 181.7964992127921 1.9311e-05 deg
tp 2460080.234418790381
(2023-May-15.73441879)
9.7146e-05 TDB
period 1777.206336382317
4.87
1.0659e-05
2.918e-08
d
yr
n .2025651116756743 1.2149e-09 deg/d
Q 3.064540047827331 1.2253e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3289  
   data-arc span      30816 days (84.37 yr)  
   first obs. used      1936-11-09  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41111  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 19:59:47  

Additional Information
 Earth MOID = 1.66611 au 
 Jupiter MOID = 2.14917 au 
 T_jup = 3.293 
[ 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 11.90   n/a E2021B10  
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

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 ]
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