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431 Nephele (A897 YB)
Classification: Main-belt Asteroid          SPK-ID: 2000431
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 54 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1703340520509526 3.1316e-08  
a 3.14054161832254 1.167e-08 au
q 2.605600438839006 9.8618e-08 au
i 1.827746495130829 3.5798e-06 deg
node 117.1859029522852 0.00011739 deg
peri 217.0537729759306 0.00011791 deg
M 117.6692894168832 1.1021e-05 deg
tp 2458336.044521635461
(2018-Aug-05.54452164)
6.2387e-05 TDB
period 2032.849636439742
5.57
1.1331e-05
3.102e-08
d
yr
n .1770913074665427 9.871e-10 deg/d
Q 3.675482797806075 1.3658e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3254  
   data-arc span      42932 days (117.54 yr)  
   first obs. used      1902-10-07  
   last obs. used      2020-04-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44518  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:05:23  

Additional Information
 Earth MOID = 1.59589 au 
 Jupiter MOID = 1.69896 au 
 T_jup = 3.187 
[ 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 8.9   n/a MPO502157 IRAS observations used: 20
diameter diameter 101.900 km 0.988 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 13.530 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2002) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pilcher, F. (2017) Minor Planet Bull. 44, 294-297.]
[Carreno, A.; Arce, E.; Fornas, G.; Mas, V. (2019) Minor Planet Bull. 46, 200-203.]
geometric albedo albedo 0.055   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.643   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=5.36 deg.
U-B UB 0.334   0.029 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=5.36 deg.
Tholen spectral type spec_T B   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B B   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)

431 Nephele (A897 YB)          Discovered 1897-Dec-18 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
(days_HH:MM)
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
1932-Sep-27 09:10 00:01 Jupiter 1.72649036552466 1.72648995209804 1.72649077895099 1.60021156527369 1.25676955181943 2426977.882271760 1.21857226058059 86.9485012200412 46.724407399031 -82.7448775073003 2568129.9257317 T 54 CATAB v2.0f-lin.ifort 2020-May-20 01:05:45 2020-May-20 01:05
1943-Jan-07 18:58 00:01 Jupiter 1.71436531843311 1.71436493933226 1.71436569753368 1.86068080973932 1.57289097714162 2430732.290383196 1.04770638050991 47.4168849328248 25.1562081054392 -75.3489879416039 2373578.69437141 T 54 CATAB v2.0f-lin.ifort 2020-May-20 01:05:45 2020-May-20 01:05
2015-Nov-23 03:14 < 00:01 Jupiter 1.73710357838249 1.73710327443153 1.73710388233325 1.61948026483491 1.28355127713895 2457349.635012759 0.229698192540866 69.1308168774212 37.0668345604696 -67.8982276205455 3047171.00201842 T 54 CATAB v2.0f-lin.ifort 2020-May-20 01:05:45 2020-May-20 01:05
2026-Mar-05 12:38 < 00:01 Jupiter 1.72302775523515 1.7230273832384 1.72302812723171 1.86240177982561 1.57650283861097 2461105.026560848 0.37702144004538 43.7670317439196 20.3261645614659 -84.8274725035494 2619763.88515485 T 54 CATAB v2.0f-lin.ifort 2020-May-20 01:05:45 2020-May-20 01:05
2099-Jan-17 14:31 00:01 Jupiter 1.73894203694617 1.73894155234856 1.73894252154357 1.61636225901309 1.28001778398567 2487721.104957006 1.46712642409606 95.327790117861 50.6688751624438 84.5971343483439 2256442.31675024 T 54 CATAB v2.0f-lin.ifort 2020-May-20 01:05:45 2020-May-20 01:05
2109-May-01 10:45 00:02 Jupiter 1.7232173093279 1.72321676528387 1.72321785337164 1.84591198501131 1.55702280550984 2491476.947620317 1.69237948654015 66.11331051403 26.4982197357749 -64.7406525742405 2065031.55267104 T 54 CATAB v2.0f-lin.ifort 2020-May-20 01:05:45 2020-May-20 01:05
2182-Mar-13 19:08 00:03 Jupiter 1.74672229050424 1.74672152584488 1.7467230551648 1.62974867453625 1.29855247016067 2518091.297231452 2.78693864073306 149.261176918183 50.2886240021305 75.8891454478096 2066050.17447407 T 54 CATAB v2.0f-lin.ifort 2020-May-20 01:05:45 2020-May-20 01:05
2192-Jun-27 06:29 00:03 Jupiter 1.73215868165583 1.73215793213702 1.73215943117474 1.85014824592538 1.56366623280142 2521849.770415378 3.03227926948512 108.253663806279 25.6774367022589 -61.9265793170914 2068217.79289469 T 54 CATAB v2.0f-lin.ifort 2020-May-20 01:05:45 2020-May-20 01:05

Alternate Designations
 A897 YB = 1933 KC = 1949 YS = 1955 DU = A906 HC 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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