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395 Delia (A894 WC)
Classification: Main-belt Asteroid          SPK-ID: 2000395
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.

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 51 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08498219750201502 3.1067e-08  
a 2.784935621244749 9.0924e-09 au
q 2.548265672249731 8.5537e-08 au
i 3.354491547810973 3.4462e-06 deg
node 259.2812709889934 4.6613e-05 deg
peri 10.93397593187238 4.9971e-05 deg
M 150.5316192970627 1.9734e-05 deg
tp 2458290.682994556336
9.0968e-05 TDB
period 1697.544496983335
n .2120710241408972 1.0386e-09 deg/d
Q 3.021605570239767 9.8651e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3212  
   data-arc span      42473 days (116.28 yr)  
   first obs. used      1903-10-24  
   last obs. used      2020-02-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43739  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:26:22  

Additional Information
 Earth MOID = 1.53221 au 
 Jupiter MOID = 2.04793 au 
 T_jup = 3.324 
[ 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 10.4   n/a MPO502156 IRAS observations used: 3
diameter diameter 44.189 km 0.455 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 19.71 h n/a LCDB (Rev. 2019-August); 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:
[Behrend, R. (2001) Observatoire de Geneve web site,]
[Behrend, R. (2006) Observatoire de Geneve web site,]
[Marciniak, A.; Pilcher, F.; Oszkiewicz, D.; Santana-Ros, T.; et al. (2015) Planet. Space Sci. 118, 256-266.]
[Ditteon, R.; Adam, A.; Doyel, M.; Gibson, J.; et al. (2018) Minor Planet Bull. 45, 13-16.]
geometric albedo albedo 0.033   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.726   0.029 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=.49, mean=3.98, max.=11.13) deg.
U-B UB 0.356   0.078 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=1.71, mean=2.16, max.=2.61) deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices
SMASSII spectral type spec_B Ch   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)

395 Delia (A894 WC)          Discovered 1894-Nov-30 by Charlois, A. at Nice
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
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
2134-Nov-17 15:25 00:03 Iris 0.0426862261614694 0.0426853167515242 0.0426871374045096 4.62568319632673 4.62568316721223 2500808.142427867 2.69006473454943 525.087028540831 24.4184040953183 -85.8214831214177 260711.976869539 T 51 CATAB v2.0f-lin.ifort 2020-Feb-22 15:26:39 2020-Feb-22 15:26

Alternate Designations
 A894 WC = 1926 SA = 1972 JF = A916 OG = A924 EM 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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