(128) Nemesis
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	15 Jun 2025	13.1	3.086 AU	2.573 AU	13h02m	-01°07'	111.0°	17.9°
Opposition	7 Jul 2026	11.2	2.725 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)                : 0.1271855
            a (Semimajor axis)              : 2.7495391
            i (Inclination)                 : 6.24704
            Ω (Longitude of ascending node) : 76.15922
            ω (Argument of perihelion)      : 302.83357
            M (Mean anomaly)                : 188.64461
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : 19.14844
            B (Latitude of perihelion)      : -5.24600
            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. A more printer-friendly version of the same chart can be found below.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-06-15 00:00 UT   13 02 58.2   -01 07 55     2.573    3.086  111.0   17.9   115   13.1 
2025-06-15 13:05 UT   13 03 02.8   -01 09 53     2.580    3.086  110.5   17.9   115   13.1 
2025-06-16 00:00 UT   13 03 06.9   -01 11 32     2.585    3.086  110.1   18.0   114   13.1 
2025-06-17 00:00 UT   13 03 16.7   -01 15 16     2.598    3.086  109.3   18.1   114   13.1 
2025-06-18 00:00 UT   13 03 27.7   -01 19 06     2.611    3.085  108.4   18.2   114   13.2 
2025-06-19 00:00 UT   13 03 39.8   -01 23 02     2.624    3.085  107.5   18.3   114   13.2 
2025-06-20 00:00 UT   13 03 53.0   -01 27 04     2.636    3.085  106.6   18.4   114   13.2 
2025-06-21 00:00 UT   13 04 07.4   -01 31 12     2.649    3.084  105.8   18.5   114   13.2 
2025-06-22 00:00 UT   13 04 22.9   -01 35 27     2.662    3.084  104.9   18.6   114   13.2 
2025-06-23 00:00 UT   13 04 39.5   -01 39 47     2.675    3.084  104.0   18.6   114   13.2 
2025-06-24 00:00 UT   13 04 57.2   -01 44 13     2.689    3.083  103.2   18.7   114   13.2 
2025-06-25 00:00 UT   13 05 16.0   -01 48 45     2.702    3.083  102.3   18.8   114   13.2 
2025-06-26 00:00 UT   13 05 35.8   -01 53 22     2.715    3.083  101.5   18.9   113   13.3 
2025-06-27 00:00 UT   13 05 56.8   -01 58 05     2.728    3.082  100.6   18.9   113   13.3 
2025-06-28 00:00 UT   13 06 18.8   -02 02 53     2.741    3.082   99.8   19.0   113   13.3 
2025-06-29 00:00 UT   13 06 41.8   -02 07 46     2.755    3.082   99.0   19.0   113   13.3 
2025-06-30 00:00 UT   13 07 05.9   -02 12 45     2.768    3.081   98.2   19.1   113   13.3 
2025-07-01 00:00 UT   13 07 31.0   -02 17 49     2.781    3.081   97.3   19.1   113   13.3 
2025-07-02 00:00 UT   13 07 57.1   -02 22 57     2.795    3.081   96.5   19.1   113   13.3 
2025-07-03 00:00 UT   13 08 24.2   -02 28 11     2.808    3.080   95.7   19.2   113   13.3 
2025-07-04 00:00 UT   13 08 52.3   -02 33 29     2.822    3.080   94.9   19.2   113   13.3 
2025-07-05 00:00 UT   13 09 21.3   -02 38 52     2.835    3.079   94.1   19.2   113   13.4 
2025-07-06 00:00 UT   13 09 51.3   -02 44 20     2.849    3.079   93.3   19.2   113   13.4 
2025-07-07 00:00 UT   13 10 22.3   -02 49 52     2.862    3.079   92.5   19.3   113   13.4 
2025-07-08 00:00 UT   13 10 54.1   -02 55 28     2.875    3.078   91.7   19.3   112   13.4 
2025-07-09 00:00 UT   13 11 26.9   -03 01 09     2.889    3.078   90.9   19.3   112   13.4 
2025-07-10 00:00 UT   13 12 00.6   -03 06 54     2.902    3.077   90.1   19.3   112   13.4 
2025-07-11 00:00 UT   13 12 35.2   -03 12 43     2.916    3.077   89.3   19.3   112   13.4 
2025-07-12 00:00 UT   13 13 10.7   -03 18 36     2.929    3.077   88.6   19.3   112   13.4 
2025-07-13 00:00 UT   13 13 47.0   -03 24 33     2.943    3.076   87.8   19.3   112   13.4 
2025-07-14 00:00 UT   13 14 24.3   -03 30 34     2.956    3.076   87.0   19.3   112   13.4 
2025-07-15 00:00 UT   13 15 02.3   -03 36 39     2.969    3.075   86.3   19.3   112   13.5 

    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.