(128) Nemesis
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Opposition	7 Jul 2026	11.3	2.726 AU	1.711 AU	19h11m	-27°21'	175.0°	1.9°
Today	9 Aug 2026	11.9	2.683 AU	1.800 AU	18h44m	-28°37'	143.3°	13.1°

The interactive orbit chart above shows the body's path through the solar system and its position at the given date. Green and blue lines are shown perpendicular to the ecliptic plane: Green if the path is above the ecliptic plane, blue if it is below. (Left-click and drag to rotate the view; Right-click and drag to move the view; Use scroll wheel to zoom in our out.)

The orbital elements of Nemesis are:

            e (Eccentricity)                : 0.1268708
            a (Semimajor axis)              : 2.7503277
            i (Inclination)                 : 6.24631
            Ω (Longitude of ascending node) : 76.15992
            ω (Argument of perihelion)      : 302.76835
            M (Mean anomaly)                : 275.14616
            Epoch                           : 2026 Jun 09

            L (Longitude of perihelion)     : 19.08373
            B (Latitude of perihelion)      : -5.24925
            P (Orbital period in years)     : 4.56            
        

The light curve chart below shows the estimated development of the minor planet's magnitude.

The all-sky chart below shows the path of the minor planet over the same period as the light curve. The current position is marked yellow.

The following chart shows the path of the minor planet in the next few days. The field of view is optimized for (~10x50) binoculars and finderscopes.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-08-09 00:00 UT   18 44 18.1   -28 37 46     1.800    2.683  143.3   13.1    78   11.9 
2026-08-09 09:20 UT   18 44 05.9   -28 38 07     1.803    2.682  142.9   13.2    78   11.9 
2026-08-10 00:00 UT   18 43 47.3   -28 38 38     1.807    2.681  142.2   13.4    78   11.9 
2026-08-11 00:00 UT   18 43 18.2   -28 39 27     1.814    2.680  141.2   13.7    79   11.9 
2026-08-12 00:00 UT   18 42 50.8   -28 40 10     1.821    2.679  140.1   14.0    79   11.9 
2026-08-13 00:00 UT   18 42 25.0   -28 40 50     1.828    2.677  139.1   14.3    79   11.9 
2026-08-14 00:00 UT   18 42 00.9   -28 41 25     1.835    2.676  138.1   14.7    80   12.0 
2026-08-15 00:00 UT   18 41 38.6   -28 41 55     1.843    2.675  137.0   15.0    80   12.0 
2026-08-16 00:00 UT   18 41 18.0   -28 42 22     1.851    2.673  136.0   15.3    80   12.0 
2026-08-17 00:00 UT   18 40 59.2   -28 42 44     1.859    2.672  135.0   15.5    80   12.0 
2026-08-18 00:00 UT   18 40 42.1   -28 43 03     1.867    2.671  134.0   15.8    81   12.0 
2026-08-19 00:00 UT   18 40 26.9   -28 43 17     1.875    2.669  133.0   16.1    81   12.0 
2026-08-20 00:00 UT   18 40 13.4   -28 43 28     1.883    2.668  132.0   16.4    81   12.1 
2026-08-21 00:00 UT   18 40 01.7   -28 43 36     1.892    2.667  131.0   16.6    81   12.1 
2026-08-22 00:00 UT   18 39 51.8   -28 43 39     1.900    2.665  130.0   16.9    81   12.1 
2026-08-23 00:00 UT   18 39 43.7   -28 43 39     1.909    2.664  129.0   17.2    82   12.1 
2026-08-24 00:00 UT   18 39 37.3   -28 43 36     1.918    2.663  128.0   17.4    82   12.1 
2026-08-25 00:00 UT   18 39 32.8   -28 43 30     1.927    2.661  127.0   17.7    82   12.2 
2026-08-26 00:00 UT   18 39 30.1   -28 43 20     1.937    2.660  126.1   17.9    82   12.2 
2026-08-27 00:00 UT   18 39 29.2   -28 43 07     1.946    2.659  125.1   18.1    82   12.2 
2026-08-28 00:00 UT   18 39 30.0   -28 42 51     1.956    2.658  124.1   18.3    82   12.2 
2026-08-29 00:00 UT   18 39 32.6   -28 42 32     1.965    2.656  123.2   18.6    82   12.2 
2026-08-30 00:00 UT   18 39 37.0   -28 42 10     1.975    2.655  122.3   18.8    83   12.2 
2026-08-31 00:00 UT   18 39 43.1   -28 41 45     1.985    2.654  121.3   19.0    83   12.3 
2026-09-01 00:00 UT   18 39 51.0   -28 41 17     1.995    2.652  120.4   19.2    83   12.3 
2026-09-02 00:00 UT   18 40 00.7   -28 40 46     2.005    2.651  119.5   19.4    83   12.3 
2026-09-03 00:00 UT   18 40 12.0   -28 40 13     2.015    2.650  118.5   19.5    83   12.3 
2026-09-04 00:00 UT   18 40 25.1   -28 39 37     2.025    2.648  117.6   19.7    83   12.3 
2026-09-05 00:00 UT   18 40 39.9   -28 38 58     2.036    2.647  116.7   19.9    83   12.3 
2026-09-06 00:00 UT   18 40 56.5   -28 38 17     2.046    2.646  115.8   20.1    83   12.3 
2026-09-07 00:00 UT   18 41 14.7   -28 37 33     2.057    2.644  114.9   20.2    83   12.4 
2026-09-08 00:00 UT   18 41 34.6   -28 36 46     2.067    2.643  114.0   20.4    83   12.4 

    Terminology:
            
    delta:  distance between minor planet and earth in AU
    radius: distance between minor planet and sun in AU
    magn:   magnitude (brightness) estimate    
    ra:     right ascension in hours (24h = 360deg)
    dec:    declination in degrees
    elong:  elongation in degrees (angle sun-earth-minor planet)    
    phase:  phase angle in degrees (angle sun-minor planet-earth)        
    AU:     Astronomical Unit (mean distance between earth and sun: 149597870.7 km
    

Orbital elements provided by the MPC (Minor Planet Center).
Calculations by a modified version of AAPlus, a C# implementation of the AA+ project by PJ Naughter from the algorithms presented in the book "Astronomical Algorithms" by Jean Meeus.
NGC2000 dso catalog and star labels from VizieR as provided by the Strasbourg astronomical Data Center.
Tycho2 catalog from the ESO archive.