(4660) Nereus
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	22 Jan 2026	22.6	1.610 AU	2.205 AU	17h15m	-24°04'	41.8°	24.0°

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 Nereus are:

            e (Eccentricity)                : 0.3587883
            a (Semimajor axis)              : 1.4849992
            i (Inclination)                 : 1.45354
            Ω (Longitude of ascending node) : 313.10701
            ω (Argument of perihelion)      : 159.54230
            M (Mean anomaly)                : 49.81687
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 292.65535
            B (Latitude of perihelion)      : 0.50799
            P (Orbital period in years)     : 1.81            
        

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
2026-01-22 00:00 UT   17 15 31.2   -24 04 58     2.205    1.610   41.8   24.0   273   22.6 
2026-01-22 23:54 UT   17 18 02.5   -24 07 41     2.202    1.615   42.2   24.2   273   22.6 
2026-01-23 00:00 UT   17 18 03.1   -24 07 41     2.202    1.615   42.2   24.2   273   22.6 
2026-01-24 00:00 UT   17 20 34.4   -24 10 16     2.200    1.619   42.6   24.3   273   22.6 
2026-01-25 00:00 UT   17 23 05.0   -24 12 40     2.197    1.624   43.1   24.5   273   22.6 
2026-01-26 00:00 UT   17 25 35.0   -24 14 55     2.194    1.628   43.5   24.6   272   22.7 
2026-01-27 00:00 UT   17 28 04.3   -24 17 00     2.191    1.632   44.0   24.8   272   22.7 
2026-01-28 00:00 UT   17 30 33.0   -24 18 57     2.188    1.637   44.4   24.9   272   22.7 
2026-01-29 00:00 UT   17 33 01.0   -24 20 44     2.185    1.641   44.9   25.0   272   22.7 
2026-01-30 00:00 UT   17 35 28.3   -24 22 22     2.182    1.646   45.3   25.2   271   22.7 
2026-01-31 00:00 UT   17 37 55.0   -24 23 50     2.178    1.650   45.8   25.3   271   22.7 
2026-02-01 00:00 UT   17 40 21.0   -24 25 11     2.175    1.654   46.2   25.5   271   22.7 
2026-02-02 00:00 UT   17 42 46.3   -24 26 22     2.171    1.659   46.7   25.6   271   22.7 
2026-02-03 00:00 UT   17 45 10.9   -24 27 25     2.167    1.663   47.2   25.8   270   22.7 
2026-02-04 00:00 UT   17 47 34.9   -24 28 19     2.164    1.667   47.6   25.9   270   22.7 
2026-02-05 00:00 UT   17 49 58.1   -24 29 05     2.160    1.671   48.1   26.0   270   22.7 
2026-02-06 00:00 UT   17 52 20.7   -24 29 43     2.156    1.676   48.6   26.2   270   22.7 

    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.