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2919 Dali (1981 EX18)
Classification: Main-belt Asteroid          SPK-ID: 2002919
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1506958203195214 1.0393e-08  
a 3.133179393302019 1.3415e-08 au
q 2.661022354420151 3.3671e-08 au
i 1.430335917714324 2.4534e-07 deg
node 161.2682547357269 1.3715e-05 deg
peri 123.9764428769392 1.772e-05 deg
M 318.1212268279246 6.5567e-06 deg
tp 2459436.150176340275
(2021-Aug-09.65017634)
3.707e-05 TDB
period 2025.705555745988
5.55
1.301e-05
3.562e-08
d
yr
n .1777158575582946 1.1414e-09 deg/d
Q 3.605336432183887 1.5437e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3048  
   data-arc span      21686 days (59.37 yr)  
   first obs. used      1961-10-18  
   last obs. used      2021-03-03  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47357  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 14:27:53  

Additional Information
 Earth MOID = 1.64302 au 
 Jupiter MOID = 1.55231 au 
 T_jup = 3.194 
[ show covariance matrix ]

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 12.12   n/a E2021B10  
diameter diameter 18.521 km 0.108 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 7.43 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Chang, C.K.; Ip, W.-H.; Lin, H.-W.; Cheng, Y.C.; et al. (2015) Astrophys. J. Supp. Ser. 219, A27.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Warner, B.D. (2017) Minor Planet Bull. 44, 12-19.]
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
geometric albedo albedo 0.125   0.022 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

2919 Dali (1981 EX18)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1981 EX18 = 1961 UN = 1971 MD = 1977 RW1 = 1978 XP 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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