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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 56 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1703340527859083 3.1277e-08  
a 3.140541617671677 1.1518e-08 au
q 2.605600435990847 9.8416e-08 au
i 1.827746595066906 3.5784e-06 deg
node 117.1858836114215 0.00011582 deg
peri 217.0537929057914 0.00011633 deg
M 117.6692890887371 1.0958e-05 deg
tp 2458336.044523694997
(2018-Aug-05.54452370)
6.1963e-05 TDB
period 2032.849635807794
5.57
1.1183e-05
3.062e-08
d
yr
n .1770913075215948 9.7423e-10 deg/d
Q 3.675482799352506 1.348e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3337  
   data-arc span      43124 days (118.07 yr)  
   first obs. used      1902-10-07  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44107  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:29:39  

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

[ hide close-approach data ]
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 09:11 00:01 Jupiter 1.72649036860763 1.72648995600243 1.72649078121262 1.60021160827794 1.25676960727269 2426977.882302607 1.20777561162409 86.1215039182589 46.7006909721387 -82.6253920544638 2569802.89876463 T 56 CATAB v2.0f-lin.ifort 2020-Nov-13 04:29:48 2020-Nov-13 04:29
1943-Jan-07 18:58 00:01 Jupiter 1.7143653174747 1.7143649387307 1.7143656962184 1.86068085320744 1.57289102838743 2430732.290386238 1.03903370159948 47.0996685378271 25.0893849730566 -75.1002206151349 2375873.76052172 T 56 CATAB v2.0f-lin.ifort 2020-Nov-13 04:29:48 2020-Nov-13 04:29
2015-Nov-23 03:14 < 00:01 Jupiter 1.73710357479068 1.73710327218233 1.73710387739883 1.61948022290587 1.28355122345082 2457349.635002294 0.224735544460286 68.4655101888214 36.7910125473685 -67.3844967133178 3063590.47794355 T 56 CATAB v2.0f-lin.ifort 2020-Nov-13 04:29:48 2020-Nov-13 04:29
2026-Mar-05 12:38 < 00:01 Jupiter 1.7230277601064 1.72302739283362 1.72302812737888 1.86240177329006 1.57650283177176 2461105.026560603 0.368658139093938 43.3251113365197 20.1642745995729 -84.8672194753985 2647013.03167817 T 56 CATAB v2.0f-lin.ifort 2020-Nov-13 04:29:48 2020-Nov-13 04:29
2099-Jan-17 14:31 00:01 Jupiter 1.7389420271762 1.73894154911202 1.73894250524018 1.61636224287282 1.28001776146632 2487721.104943878 1.44470679396033 93.9411076756788 50.3894654912378 84.9523330893007 2272410.95370549 T 56 CATAB v2.0f-lin.ifort 2020-Nov-13 04:29:48 2020-Nov-13 04:29
2109-May-01 10:45 00:02 Jupiter 1.72321731968422 1.72321678547962 1.72321785388853 1.84591203072998 1.55702286160838 2491476.947598245 1.66709550501374 65.1457148493416 26.2100859270597 -64.8992393834295 2091735.44205897 T 56 CATAB v2.0f-lin.ifort 2020-Nov-13 04:29:48 2020-Nov-13 04:29
2182-Mar-13 19:08 00:03 Jupiter 1.74672227555967 1.74672152203158 1.74672302908896 1.62974861260646 1.29855238924067 2518091.297192625 2.74812491625228 147.113019542397 50.057067426839 75.9914116483097 2078649.38078919 T 56 CATAB v2.0f-lin.ifort 2020-Nov-13 04:29:48 2020-Nov-13 04:29
2192-Jun-27 06:29 00:03 Jupiter 1.73215869566027 1.73215795944798 1.73215943187265 1.85014832970383 1.56366633445744 2521849.770375965 2.99039388759511 106.654713394444 25.4129492542863 -61.9906498930161 2091419.48901312 T 56 CATAB v2.0f-lin.ifort 2020-Nov-13 04:29:48 2020-Nov-13 04:29

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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