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869 Mellena (A917 JB)
Classification: Main-belt Asteroid          SPK-ID: 2000869
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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 47 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .220028717149572 1.667e-08  
a 2.689083394035981 7.7127e-09 au
q 2.097407824538027 4.4129e-08 au
i 7.838266638321725 7.622e-07 deg
node 154.8761964074202 6.4867e-06 deg
peri 107.1218631680469 7.6053e-06 deg
M 135.0646558834719 5.3593e-06 deg
tp 2458596.211890553430
(2019-Apr-22.71189055)
2.2782e-05 TDB
period 1610.663559447061
4.41
6.9295e-06
1.897e-08
d
yr
n .2235103649601333 9.6159e-10 deg/d
Q 3.280758963533935 9.4097e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3151  
   data-arc span      37935 days (103.86 yr)  
   first obs. used      1917-05-10  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40964  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 18:57:45  

Additional Information
 Earth MOID = 1.09652 au 
 Jupiter MOID = 1.86792 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 11.97   n/a MPCxxxxx  
diameter diameter 21.193 km 0.090 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 6.5155 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Stephens, R.D. (2010) Minor Planet Bull. 37, 159-161.]
[Carbognani, A. (2011) Minor Planet Bull. 38, 57-63.]
[Ferrero, A. (2011) Entry on CALL web site. http://www.minorplanet.info/call.html]
[Owings, L.E. (2011) Minor Planet Bull. 38, 9-10.]
[Franco, L.; Marchini, A.; Arena, C.; Casalnuovo, G.B.; et al. (2020) Minor Planet Bull. 47, 61-63.]
geometric albedo albedo 0.065   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

869 Mellena (A917 JB)          Discovered 1917-May-09 by Schorr, R. at Bergedorf
Independent discovery May 10 by M. Wolf, Heidelberg, was announced first.
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
1906-Oct-01 01:09 00:01 Jupiter 1.93860291658203 1.93860228685719 1.93860354630554 1.42859002415683 1.08028749644906 2417484.548190825 1.48866761741046 159.2571653628 8.47916920999089 0.343614106064992 1317964.3134221 T 47 CATAB v2.0g-lin.ifort 2021-May-03 18:59:00 2021-May-03 18:59
1941-Nov-10 06:38 < 00:01 Jupiter 1.86376735719675 1.86376710708753 1.86376760730661 1.19063793910311 0.713220037849974 2430308.776090609 0.991721600613667 199.627589208476 91.4716790962947 -13.1389124130591 4094461.9360405 T 47 CATAB v2.0g-lin.ifort 2021-May-03 18:59:00 2021-May-03 18:59
1976-Dec-24 14:29 < 00:01 Jupiter 1.86406982431768 1.86406963149854 1.86407001713662 1.42872502803881 1.0641742392935 2443137.103170850 0.512251228124975 90.6885550415818 27.6221506659043 1.74136385818447 2789941.10381361 T 47 CATAB v2.0g-lin.ifort 2021-May-03 18:59:00 2021-May-03 18:59
2012-Feb-05 07:49 < 00:01 Jupiter 1.91934742020132 1.91934720124054 1.91934763916199 1.99584936349935 1.76090873645136 2455962.825479019 0.0932572357292517 12.4891199628098 6.60046395675736 -8.00195425359798 3601178.56869828 T 47 CATAB v2.0g-lin.ifort 2021-May-03 18:59:00 2021-May-03 18:59
2096-Oct-17 10:41 00:01 Jupiter 1.9708633899618 1.97086298719768 1.9708637927258 1.66842627154625 1.38711989541785 2486898.945467893 1.03246446581003 58.7756899198635 4.53699301629239 37.6294169268624 11148805.9203147 T 47 CATAB v2.0g-lin.ifort 2021-May-03 18:59:00 2021-May-03 18:59
2131-Nov-29 05:52 00:01 Jupiter 1.88504534542081 1.88504504523154 1.88504564560999 1.26346939843148 0.83527176099485 2499723.744625193 1.46768092423876 199.675414758919 48.9485597220596 -17.96679453341 3558197.87493784 T 47 CATAB v2.0g-lin.ifort 2021-May-03 18:59:00 2021-May-03 18:59
2167-Jan-11 08:20 00:02 Jupiter 1.86499434507202 1.86499412032662 1.86499456981763 1.25889857813483 0.822488749618906 2512550.846966180 1.93293322861409 353.00482111627 66.1052872791511 21.9757793292213 3057288.50806426 T 47 CATAB v2.0g-lin.ifort 2021-May-03 18:59:00 2021-May-03 18:59

Alternate Designations
 A917 JB = 1931 RC = 1944 OB = 1952 DL2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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