(128) Nemesis
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	9 Jun 2026	11.9	2.763 AU	1.859 AU	19h33m	-25°25'	146.6°	11.7°
Opposition	7 Jul 2026	11.3	2.726 AU	1.711 AU	19h11m	-27°21'	175.0°	1.9°

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)                : 0.1270064
            a (Semimajor axis)              : 2.7499731
            i (Inclination)                 : 6.24684
            Ω (Longitude of ascending node) : 76.16032
            ω (Argument of perihelion)      : 302.81291
            M (Mean anomaly)                : 231.88964
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 19.12882
            B (Latitude of perihelion)      : -5.24706
            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
2026-06-09 00:00 UT   19 33 27.3   -25 25 55     1.859    2.763  146.6   11.7   267   11.9 
2026-06-09 10:29 UT   19 33 14.4   -25 27 38     1.855    2.763  147.1   11.5   267   11.9 
2026-06-10 00:00 UT   19 32 57.3   -25 29 51     1.850    2.762  147.7   11.3   267   11.9 
2026-06-11 00:00 UT   19 32 25.8   -25 33 49     1.842    2.760  148.8   11.0   267   11.9 
2026-06-12 00:00 UT   19 31 52.8   -25 37 50     1.834    2.759  149.8   10.7   268   11.9 
2026-06-13 00:00 UT   19 31 18.3   -25 41 53     1.826    2.758  150.9   10.3   268   11.8 
2026-06-14 00:00 UT   19 30 42.3   -25 45 58     1.818    2.757  152.0   10.0   269   11.8 
2026-06-15 00:00 UT   19 30 04.9   -25 50 05     1.811    2.755  153.1    9.6   269   11.8 
2026-06-16 00:00 UT   19 29 26.1   -25 54 14     1.804    2.754  154.2    9.2   270   11.8 
2026-06-17 00:00 UT   19 28 45.9   -25 58 24     1.797    2.753  155.3    8.9   270   11.8 
2026-06-18 00:00 UT   19 28 04.5   -26 02 35     1.790    2.751  156.4    8.5   271   11.7 
2026-06-19 00:00 UT   19 27 21.7   -26 06 47     1.784    2.750  157.5    8.1   272   11.7 
2026-06-20 00:00 UT   19 26 37.7   -26 10 60     1.778    2.749  158.6    7.8   272   11.7 
2026-06-21 00:00 UT   19 25 52.4   -26 15 13     1.772    2.747  159.7    7.4   273   11.7 
2026-06-22 00:00 UT   19 25 06.1   -26 19 26     1.766    2.746  160.8    7.0   274   11.6 
2026-06-23 00:00 UT   19 24 18.6   -26 23 39     1.761    2.745  161.9    6.6   275   11.6 
2026-06-24 00:00 UT   19 23 30.0   -26 27 51     1.755    2.743  162.9    6.2   276   11.6 
2026-06-25 00:00 UT   19 22 40.4   -26 32 03     1.751    2.742  164.0    5.8   278   11.5 
2026-06-26 00:00 UT   19 21 49.8   -26 36 14     1.746    2.741  165.1    5.5   279   11.5 
2026-06-27 00:00 UT   19 20 58.4   -26 40 24     1.742    2.739  166.2    5.1   281   11.5 
2026-06-28 00:00 UT   19 20 06.0   -26 44 32     1.737    2.738  167.3    4.7   283   11.5 
2026-06-29 00:00 UT   19 19 12.8   -26 48 39     1.734    2.737  168.3    4.3   285   11.4 
2026-06-30 00:00 UT   19 18 18.9   -26 52 44     1.730    2.735  169.4    3.9   288   11.4 
2026-07-01 00:00 UT   19 17 24.2   -26 56 46     1.727    2.734  170.4    3.6   291   11.4 
2026-07-02 00:00 UT   19 16 28.9   -27 00 47     1.723    2.733  171.4    3.2   295   11.4 
2026-07-03 00:00 UT   19 15 33.1   -27 04 44     1.721    2.731  172.3    2.9   300   11.3 
2026-07-04 00:00 UT   19 14 36.7   -27 08 39     1.718    2.730  173.2    2.5   307   11.3 
2026-07-05 00:00 UT   19 13 39.8   -27 12 31     1.716    2.729  173.9    2.3   315   11.3 
2026-07-06 00:00 UT   19 12 42.5   -27 16 19     1.714    2.728  174.5    2.0   325   11.3 
2026-07-07 00:00 UT   19 11 44.9   -27 20 04     1.712    2.726  174.9    1.9   337   11.3 
2026-07-08 00:00 UT   19 10 47.0   -27 23 45     1.711    2.725  175.1    1.8   351   11.2 
2026-07-09 00:00 UT   19 09 48.9   -27 27 23     1.709    2.724  175.0    1.9     4   11.2 

    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.