(42) Isis
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	16 Nov 2025	12.1	2.659 AU	1.904 AU	06h54m	+23°16'	131.0°	16.3°
Opposition	25 Dec 2025	11.3	2.736 AU	1.753 AU	06h20m	+25°42'	177.4°	0.9°

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 Isis are:

            e (Eccentricity)                : 0.2219265
            a (Semimajor axis)              : 2.4437922
            i (Inclination)                 : 8.51002
            Ω (Longitude of ascending node) : 84.16707
            ω (Argument of perihelion)      : 237.41146
            M (Mean anomaly)                : 103.03901
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 141.29001
            B (Latitude of perihelion)      : -7.16251
            P (Orbital period in years)     : 3.82            
        

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
2025-11-16 00:00 UT   06 54 45.0   +23 16 49     1.904    2.659  131.0   16.3   275   12.1 
2025-11-16 09:54 UT   06 54 36.3   +23 18 09     1.900    2.660  131.4   16.2   275   12.1 
2025-11-17 00:00 UT   06 54 23.4   +23 20 04     1.896    2.661  132.1   16.0   275   12.1 
2025-11-18 00:00 UT   06 53 59.9   +23 23 23     1.888    2.663  133.2   15.7   275   12.1 
2025-11-19 00:00 UT   06 53 34.5   +23 26 46     1.880    2.665  134.3   15.4   275   12.0 
2025-11-20 00:00 UT   06 53 07.2   +23 30 11     1.872    2.668  135.4   15.1   275   12.0 
2025-11-21 00:00 UT   06 52 38.1   +23 33 40     1.865    2.670  136.5   14.8   274   12.0 
2025-11-22 00:00 UT   06 52 07.0   +23 37 12     1.857    2.672  137.6   14.4   274   12.0 
2025-11-23 00:00 UT   06 51 34.2   +23 40 47     1.850    2.674  138.8   14.1   274   12.0 
2025-11-24 00:00 UT   06 50 59.5   +23 44 24     1.843    2.676  139.9   13.7   274   12.0 
2025-11-25 00:00 UT   06 50 23.0   +23 48 04     1.837    2.678  141.1   13.4   274   11.9 
2025-11-26 00:00 UT   06 49 44.8   +23 51 47     1.830    2.680  142.3   13.0   274   11.9 
2025-11-27 00:00 UT   06 49 04.7   +23 55 31     1.824    2.682  143.4   12.7   274   11.9 
2025-11-28 00:00 UT   06 48 23.0   +23 59 18     1.818    2.684  144.6   12.3   273   11.9 
2025-11-29 00:00 UT   06 47 39.6   +24 03 07     1.812    2.686  145.8   11.9   273   11.9 
2025-11-30 00:00 UT   06 46 54.5   +24 06 57     1.806    2.688  147.0   11.5   273   11.8 
2025-12-01 00:00 UT   06 46 07.8   +24 10 48     1.801    2.690  148.2   11.2   273   11.8 
2025-12-02 00:00 UT   06 45 19.5   +24 14 41     1.796    2.692  149.4   10.8   272   11.8 
2025-12-03 00:00 UT   06 44 29.6   +24 18 35     1.791    2.694  150.6   10.4   272   11.8 
2025-12-04 00:00 UT   06 43 38.3   +24 22 30     1.786    2.696  151.8   10.0   272   11.8 
2025-12-05 00:00 UT   06 42 45.4   +24 26 25     1.782    2.697  153.0    9.6   272   11.7 
2025-12-06 00:00 UT   06 41 51.2   +24 30 21     1.778    2.699  154.2    9.1   271   11.7 
2025-12-07 00:00 UT   06 40 55.6   +24 34 17     1.774    2.701  155.4    8.7   271   11.7 
2025-12-08 00:00 UT   06 39 58.7   +24 38 12     1.771    2.703  156.7    8.3   270   11.7 
2025-12-09 00:00 UT   06 39 00.5   +24 42 07     1.767    2.705  157.9    7.9   270   11.7 
2025-12-10 00:00 UT   06 38 01.0   +24 46 02     1.764    2.707  159.1    7.4   270   11.6 
2025-12-11 00:00 UT   06 37 00.4   +24 49 56     1.761    2.709  160.4    7.0   269   11.6 
2025-12-12 00:00 UT   06 35 58.8   +24 53 49     1.759    2.711  161.6    6.6   268   11.6 
2025-12-13 00:00 UT   06 34 56.0   +24 57 40     1.757    2.713  162.9    6.1   268   11.6 
2025-12-14 00:00 UT   06 33 52.3   +25 01 30     1.755    2.715  164.1    5.7   267   11.5 
2025-12-15 00:00 UT   06 32 47.8   +25 05 19     1.753    2.717  165.4    5.3   266   11.5 
2025-12-16 00:00 UT   06 31 42.3   +25 09 05     1.752    2.719  166.6    4.8   265   11.5 

    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.