(128) Nemesis
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Opposition	11 Apr 2025	12.0	3.099 AU	2.102 AU	13h33m	-01°39'	172.5°	2.4°
Today	8 May 2025	12.5	3.096 AU	2.187 AU	13h12m	-00°22'	148.9°	9.7°

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
2025-05-08 00:00 UT   13 12 34.9   +00 22 48     2.187    3.096  148.9    9.7   124   12.5 
2025-05-08 06:23 UT   13 12 25.0   +00 22 26     2.189    3.096  148.6    9.8   124   12.5 
2025-05-09 00:00 UT   13 11 58.0   +00 21 29     2.194    3.095  147.8   10.0   123   12.5 
2025-05-10 00:00 UT   13 11 22.1   +00 20 19     2.201    3.095  146.7   10.3   123   12.5 
2025-05-11 00:00 UT   13 10 47.2   +00 19 16     2.208    3.095  145.7   10.6   122   12.5 
2025-05-12 00:00 UT   13 10 13.4   +00 18 22     2.216    3.095  144.6   10.9   122   12.6 
2025-05-13 00:00 UT   13 09 40.7   +00 17 36     2.224    3.095  143.5   11.2   121   12.6 
2025-05-14 00:00 UT   13 09 09.1   +00 16 58     2.231    3.095  142.4   11.5   121   12.6 
2025-05-15 00:00 UT   13 08 38.6   +00 16 29     2.240    3.094  141.4   11.8   121   12.6 
2025-05-16 00:00 UT   13 08 09.2   +00 16 08     2.248    3.094  140.3   12.0   120   12.6 
2025-05-17 00:00 UT   13 07 41.0   +00 15 55     2.256    3.094  139.3   12.3   120   12.6 
2025-05-18 00:00 UT   13 07 13.9   +00 15 51     2.265    3.094  138.2   12.6   120   12.7 
2025-05-19 00:00 UT   13 06 48.1   +00 15 55     2.274    3.094  137.2   12.8   119   12.7 
2025-05-20 00:00 UT   13 06 23.4   +00 16 07     2.283    3.093  136.1   13.1   119   12.7 
2025-05-21 00:00 UT   13 05 59.9   +00 16 27     2.293    3.093  135.1   13.4   119   12.7 
2025-05-22 00:00 UT   13 05 37.6   +00 16 56     2.302    3.093  134.1   13.6   119   12.7 
2025-05-23 00:00 UT   13 05 16.6   +00 17 33     2.312    3.093  133.1   13.8   118   12.8 
2025-05-24 00:00 UT   13 04 56.8   +00 18 19     2.321    3.092  132.0   14.1   118   12.8 
2025-05-25 00:00 UT   13 04 38.2   +00 19 12     2.331    3.092  131.0   14.3   118   12.8 
2025-05-26 00:00 UT   13 04 20.9   +00 20 14     2.342    3.092  130.0   14.5   118   12.8 
2025-05-27 00:00 UT   13 04 04.9   +00 21 24     2.352    3.092  129.0   14.7   117   12.8 
2025-05-28 00:00 UT   13 03 50.1   +00 22 43     2.362    3.091  128.0   15.0   117   12.8 
2025-05-29 00:00 UT   13 03 36.5   +00 24 09     2.373    3.091  127.0   15.2   117   12.9 
2025-05-30 00:00 UT   13 03 24.3   +00 25 43     2.384    3.091  126.0   15.4   117   12.9 
2025-05-31 00:00 UT   13 03 13.3   +00 27 26     2.395    3.091  125.1   15.6   117   12.9 
2025-06-01 00:00 UT   13 03 03.6   +00 29 16     2.406    3.090  124.1   15.8   117   12.9 
2025-06-02 00:00 UT   13 02 55.2   +00 31 14     2.417    3.090  123.1   16.0   116   12.9 
2025-06-03 00:00 UT   13 02 48.0   +00 33 20     2.428    3.090  122.2   16.1   116   12.9 
2025-06-04 00:00 UT   13 02 42.1   +00 35 33     2.440    3.090  121.2   16.3   116   13.0 
2025-06-05 00:00 UT   13 02 37.4   +00 37 54     2.451    3.089  120.3   16.5   116   13.0 
2025-06-06 00:00 UT   13 02 34.0   +00 40 22     2.463    3.089  119.3   16.6   116   13.0 
2025-06-07 00:00 UT   13 02 31.8   +00 42 58     2.475    3.089  118.4   16.8   116   13.0 

    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.