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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 37 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .3224979799243295 | 3.1348e-08 | |
| a | 2.671602004432988 | 6.748e-09 | au |
| q | 1.81001575484156 | 8.251e-08 | au |
| i | 15.8876286858625 | 3.6213e-06 | deg |
| node | 229.9935779595105 | 1.3154e-05 | deg |
| peri | 111.7896761808255 | 1.4093e-05 | deg |
| M | 156.5245519361261 | 5.7737e-06 | deg |
| tp | 2458307.016653434608
(2018-Jul-07.51665343) | 2.4556e-05 | TDB |
| period | 1594.98303413396
4.37 | 6.043e-06
1.654e-08 | d
yr |
| n | .2257077299856495 | 8.5515e-10 | deg/d |
| Q | 3.533188254024416 | 8.9242e-09 | au |
|
| | Orbit Determination Parameters
Additional Information
|
[ show covariance matrix ]
Physical Parameter Table
| Parameter |
Symbol |
Value |
Units |
Sigma |
Reference |
Notes |
| absolute magnitude |
H |
9.2 |
|
n/a |
MPO502159 |
IRAS observations used: 24 |
| diameter |
diameter |
121.891 |
km |
0.721 |
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M) |
|
| rotation period |
rot_per |
5.925 |
h |
n/a |
LCDB (Rev. 2020-October); Warner et al., 2009 |
Published Reference List:
[Zeigler, K.W.; Tomlinson, D. (1984) Minor Planet Bull. 11, 21-22.]
[Zeigler, K.W.; Florence, W.B. (1985) Icarus 62, 512-517.]
[Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R.; Greenberg, R.; et al. (1987) Icarus 70, 191-245.]
[Drummond, J.D.; Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R. (1988) Icarus 76, 19-77.]
[Drummond, J.D.; Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R. (1991) Icarus 89, 44-64.]
[Michalowski, T. (1993) Icarus 106, 563-572.]
[De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.]
[Hainaut-Rouelle, M.-C.; Hainaut, O.R.; Detal, A. (1995) Astron. Astrophys. Suppl. Ser. 112, 125-142.]
[Chiorny, V.G.; Shevchenko, V.G.; Krugly, Yu.N.; Velichko, F.P.; Gaftonyuk, N.M. (2003) Abstracts of Photometry and Polarimetry of Asteroids: Impact on Collaboration, Kharkiv, 9-10.]
[Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.]
[Chiorny, V.G.; Shevchenko, V.G.; Krugly, Yu.N.; Velichko, F.P.; Gaftonyuk, N.M. (2007) Planet. Space Sci. 55, 986-997.]
[Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Alton, K.B. (2019) Minor Planet Bull. 46, 114-117.] |
| geometric albedo |
albedo |
0.026 |
|
0.003 |
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M) |
|
| B-V |
BV |
0.712 |
|
0.009 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#obs=4; phase (min.=7.91, mean=12.19, max.=20.28) deg. |
| U-B |
UB |
0.347 |
|
0.030 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#obs=1; phase=9.12 deg. |
| Tholen spectral type |
spec_T |
CP: |
|
n/a |
EAR-A-5-DDR-TAXONOMY-V4.0 |
used 2 color indices; used ground-based radiometric albedo |
|
| 694 Ekard (A909 VC) Discovered 1909-Nov-07 by Metcalf, J. H. at Taunton |
| Independent discovery Nov. 9 by J. Helffrich, Heidelberg, was announced first. |
| Reference: DISCOVERY.DB | Last Updated: 2003-08-29 |
|
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