(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	20 Jul 2026	11.5	2.709 AU	1.714 AU	18h59m	-28°02'	165.2°	5.5°

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
2026-07-20 00:00 UT   18 59 17.4   -28 02 07     1.714    2.709  165.2    5.5    64   11.5 
2026-07-20 08:07 UT   18 58 58.7   -28 03 02     1.715    2.709  164.8    5.6    64   11.5 
2026-07-21 00:00 UT   18 58 22.5   -28 04 46     1.716    2.708  164.1    5.9    65   11.5 
2026-07-22 00:00 UT   18 57 28.3   -28 07 19     1.718    2.706  163.0    6.3    67   11.5 
2026-07-23 00:00 UT   18 56 34.9   -28 09 47     1.721    2.705  161.9    6.7    68   11.5 
2026-07-24 00:00 UT   18 55 42.3   -28 12 09     1.724    2.704  160.8    7.1    69   11.5 
2026-07-25 00:00 UT   18 54 50.6   -28 14 26     1.727    2.702  159.7    7.5    70   11.6 
2026-07-26 00:00 UT   18 53 59.9   -28 16 37     1.730    2.701  158.6    7.9    71   11.6 
2026-07-27 00:00 UT   18 53 10.2   -28 18 42     1.734    2.700  157.5    8.3    72   11.6 
2026-07-28 00:00 UT   18 52 21.6   -28 20 42     1.737    2.698  156.4    8.7    72   11.6 
2026-07-29 00:00 UT   18 51 34.1   -28 22 36     1.741    2.697  155.3    9.1    73   11.6 
2026-07-30 00:00 UT   18 50 47.8   -28 24 25     1.746    2.696  154.1    9.5    74   11.7 
2026-07-31 00:00 UT   18 50 02.6   -28 26 08     1.750    2.694  153.0    9.8    74   11.7 
2026-08-01 00:00 UT   18 49 18.8   -28 27 47     1.755    2.693  151.9   10.2    75   11.7 
2026-08-02 00:00 UT   18 48 36.2   -28 29 19     1.760    2.692  150.9   10.6    75   11.7 
2026-08-03 00:00 UT   18 47 55.0   -28 30 47     1.765    2.691  149.8   10.9    76   11.7 
2026-08-04 00:00 UT   18 47 15.2   -28 32 09     1.770    2.689  148.7   11.3    76   11.8 
2026-08-05 00:00 UT   18 46 36.7   -28 33 26     1.776    2.688  147.6   11.7    77   11.8 
2026-08-06 00:00 UT   18 45 59.8   -28 34 38     1.782    2.687  146.5   12.0    77   11.8 
2026-08-07 00:00 UT   18 45 24.3   -28 35 46     1.788    2.685  145.4   12.4    77   11.8 
2026-08-08 00:00 UT   18 44 50.4   -28 36 48     1.794    2.684  144.4   12.7    78   11.8 
2026-08-09 00:00 UT   18 44 18.1   -28 37 46     1.800    2.683  143.3   13.1    78   11.9 
2026-08-10 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 

    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.