(128) Nemesis
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	23 Apr 2026	12.9	2.824 AU	2.431 AU	19h27m	-23°37'	102.4°	20.3°
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
2026-04-23 00:00 UT   19 27 51.6   -23 37 45     2.431    2.824  102.4   20.3   262   12.9 
2026-04-23 14:35 UT   19 28 15.8   -23 38 11     2.422    2.823  102.9   20.3   262   12.9 
2026-04-24 00:00 UT   19 28 31.1   -23 38 29     2.416    2.822  103.3   20.3   262   12.9 
2026-04-25 00:00 UT   19 29 09.5   -23 39 16     2.402    2.821  104.1   20.2   262   12.8 
2026-04-26 00:00 UT   19 29 46.7   -23 40 06     2.388    2.820  104.9   20.2   262   12.8 
2026-04-27 00:00 UT   19 30 22.6   -23 40 60     2.373    2.818  105.8   20.1   262   12.8 
2026-04-28 00:00 UT   19 30 57.3   -23 41 57     2.359    2.817  106.6   20.0   262   12.8 
2026-04-29 00:00 UT   19 31 30.8   -23 42 58     2.345    2.816  107.5   19.9   262   12.8 
2026-04-30 00:00 UT   19 32 02.9   -23 44 03     2.331    2.815  108.3   19.9   262   12.8 
2026-05-01 00:00 UT   19 32 33.8   -23 45 11     2.317    2.813  109.2   19.8   262   12.7 
2026-05-02 00:00 UT   19 33 03.4   -23 46 23     2.303    2.812  110.0   19.7   262   12.7 
2026-05-03 00:00 UT   19 33 31.7   -23 47 39     2.289    2.811  110.9   19.6   262   12.7 
2026-05-04 00:00 UT   19 33 58.6   -23 48 59     2.275    2.810  111.8   19.5   262   12.7 
2026-05-05 00:00 UT   19 34 24.2   -23 50 23     2.261    2.808  112.6   19.4   262   12.7 
2026-05-06 00:00 UT   19 34 48.4   -23 51 51     2.248    2.807  113.5   19.2   262   12.7 
2026-05-07 00:00 UT   19 35 11.2   -23 53 24     2.234    2.806  114.4   19.1   262   12.6 
2026-05-08 00:00 UT   19 35 32.6   -23 55 00     2.221    2.805  115.3   19.0   262   12.6 
2026-05-09 00:00 UT   19 35 52.6   -23 56 42     2.207    2.803  116.2   18.8   262   12.6 
2026-05-10 00:00 UT   19 36 11.2   -23 58 27     2.194    2.802  117.1   18.7   262   12.6 
2026-05-11 00:00 UT   19 36 28.3   -24 00 17     2.181    2.801  118.0   18.6   262   12.6 
2026-05-12 00:00 UT   19 36 43.9   -24 02 11     2.168    2.799  118.9   18.4   262   12.5 
2026-05-13 00:00 UT   19 36 58.1   -24 04 10     2.155    2.798  119.8   18.3   262   12.5 
2026-05-14 00:00 UT   19 37 10.7   -24 06 14     2.142    2.797  120.7   18.1   262   12.5 
2026-05-15 00:00 UT   19 37 21.8   -24 08 22     2.129    2.796  121.7   17.9   262   12.5 
2026-05-16 00:00 UT   19 37 31.4   -24 10 35     2.117    2.794  122.6   17.7   262   12.5 
2026-05-17 00:00 UT   19 37 39.5   -24 12 53     2.104    2.793  123.5   17.6   262   12.4 
2026-05-18 00:00 UT   19 37 46.0   -24 15 15     2.092    2.792  124.5   17.4   262   12.4 
2026-05-19 00:00 UT   19 37 51.0   -24 17 42     2.079    2.790  125.4   17.2   262   12.4 
2026-05-20 00:00 UT   19 37 54.3   -24 20 13     2.067    2.789  126.4   17.0   263   12.4 
2026-05-21 00:00 UT   19 37 56.1   -24 22 50     2.055    2.788  127.4   16.8   263   12.4 
2026-05-22 00:00 UT   19 37 56.4   -24 25 31     2.043    2.787  128.3   16.6   263   12.3 
2026-05-23 00:00 UT   19 37 55.0   -24 28 16     2.032    2.785  129.3   16.3   263   12.3 

    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.