(128) Nemesis
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	30 Jun 2026	11.4	2.736 AU	1.730 AU	19h18m	-26°52'	169.4°	3.9°
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)                : 0.1268708
            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
2026-06-30 00:00 UT   19 18 19.1   -26 52 42     1.730    2.736  169.4    3.9   288   11.4 
2026-06-30 01:18 UT   19 18 16.2   -26 52 55     1.730    2.736  169.4    3.9   288   11.4 
2026-07-01 00:00 UT   19 17 24.5   -26 56 45     1.727    2.734  170.4    3.6   291   11.4 
2026-07-02 00:00 UT   19 16 29.2   -27 00 45     1.724    2.733  171.4    3.2   295   11.4 
2026-07-03 00:00 UT   19 15 33.3   -27 04 42     1.721    2.732  172.3    2.9   300   11.3 
2026-07-04 00:00 UT   19 14 36.9   -27 08 37     1.718    2.730  173.2    2.5   307   11.3 
2026-07-05 00:00 UT   19 13 40.1   -27 12 29     1.716    2.729  173.9    2.3   315   11.3 
2026-07-06 00:00 UT   19 12 42.8   -27 16 17     1.714    2.728  174.5    2.0   325   11.3 
2026-07-07 00:00 UT   19 11 45.2   -27 20 02     1.712    2.726  174.9    1.9   337   11.3 
2026-07-08 00:00 UT   19 10 47.3   -27 23 44     1.711    2.725  175.1    1.8   351   11.2 
2026-07-09 00:00 UT   19 09 49.2   -27 27 21     1.710    2.724  175.0    1.9     4   11.2 
2026-07-10 00:00 UT   19 08 51.0   -27 30 54     1.709    2.722  174.6    2.0    16   11.3 
2026-07-11 00:00 UT   19 07 52.7   -27 34 23     1.708    2.721  174.0    2.2    27   11.3 
2026-07-12 00:00 UT   19 06 54.4   -27 37 48     1.708    2.720  173.2    2.5    35   11.3 
2026-07-13 00:00 UT   19 05 56.2   -27 41 08     1.707    2.718  172.4    2.8    42   11.3 
2026-07-14 00:00 UT   19 04 58.2   -27 44 23     1.708    2.717  171.5    3.2    47   11.3 
2026-07-15 00:00 UT   19 04 00.4   -27 47 33     1.708    2.716  170.5    3.5    51   11.4 
2026-07-16 00:00 UT   19 03 02.9   -27 50 39     1.709    2.714  169.5    3.9    55   11.4 
2026-07-17 00:00 UT   19 02 05.8   -27 53 39     1.710    2.713  168.4    4.3    57   11.4 
2026-07-18 00:00 UT   19 01 09.1   -27 56 34     1.711    2.712  167.4    4.7    60   11.4 
2026-07-19 00:00 UT   19 00 12.9   -27 59 23     1.712    2.710  166.3    5.1    62   11.4 
2026-07-20 00:00 UT   18 59 17.4   -28 02 07     1.714    2.709  165.2    5.5    64   11.5 
2026-07-21 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 

    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.