(42) Isis
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Opposition	25 Dec 2025	11.3	2.736 AU	1.753 AU	06h20m	+25°42'	177.4°	0.9°
Today	13 Jan 2026	11.8	2.769 AU	1.835 AU	06h00m	+26°31'	157.6°	7.8°

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
2026-01-13 00:00 UT   06 00 57.3   +26 31 15     1.835    2.769  157.6    7.8    98   11.8 
2026-01-13 00:31 UT   06 00 56.1   +26 31 17     1.835    2.769  157.6    7.8    98   11.8 
2026-01-14 00:00 UT   06 00 01.8   +26 33 11     1.842    2.771  156.4    8.2    97   11.8 
2026-01-15 00:00 UT   05 59 07.7   +26 35 04     1.849    2.773  155.1    8.6    97   11.8 
2026-01-16 00:00 UT   05 58 15.1   +26 36 53     1.857    2.774  153.9    9.0    96   11.9 
2026-01-17 00:00 UT   05 57 23.9   +26 38 39     1.865    2.776  152.7    9.3    96   11.9 
2026-01-18 00:00 UT   05 56 34.2   +26 40 21     1.873    2.778  151.5    9.7    96   11.9 
2026-01-19 00:00 UT   05 55 46.0   +26 41 59     1.881    2.780  150.3   10.1    95   11.9 
2026-01-20 00:00 UT   05 54 59.5   +26 43 34     1.890    2.781  149.2   10.5    95   12.0 
2026-01-21 00:00 UT   05 54 14.5   +26 45 06     1.899    2.783  148.0   10.8    95   12.0 
2026-01-22 00:00 UT   05 53 31.3   +26 46 35     1.908    2.785  146.8   11.2    94   12.0 
2026-01-23 00:00 UT   05 52 49.7   +26 48 01     1.918    2.786  145.6   11.5    94   12.0 
2026-01-24 00:00 UT   05 52 09.9   +26 49 24     1.927    2.788  144.5   11.8    94   12.1 
2026-01-25 00:00 UT   05 51 31.8   +26 50 44     1.937    2.790  143.3   12.2    94   12.1 
2026-01-26 00:00 UT   05 50 55.5   +26 52 01     1.947    2.791  142.2   12.5    94   12.1 
2026-01-27 00:00 UT   05 50 20.9   +26 53 16     1.958    2.793  141.0   12.8    93   12.1 
2026-01-28 00:00 UT   05 49 48.2   +26 54 29     1.968    2.794  139.9   13.1    93   12.2 
2026-01-29 00:00 UT   05 49 17.3   +26 55 39     1.979    2.796  138.8   13.4    93   12.2 
2026-01-30 00:00 UT   05 48 48.1   +26 56 47     1.990    2.798  137.6   13.7    93   12.2 
2026-01-31 00:00 UT   05 48 20.9   +26 57 53     2.001    2.799  136.5   14.0    93   12.2 
2026-02-01 00:00 UT   05 47 55.4   +26 58 57     2.012    2.801  135.4   14.3    92   12.3 
2026-02-02 00:00 UT   05 47 31.8   +26 59 59     2.024    2.803  134.3   14.6    92   12.3 
2026-02-03 00:00 UT   05 47 09.9   +27 00 60     2.035    2.804  133.2   14.8    92   12.3 
2026-02-04 00:00 UT   05 46 50.0   +27 01 58     2.047    2.806  132.2   15.1    92   12.3 
2026-02-05 00:00 UT   05 46 31.8   +27 02 55     2.059    2.807  131.1   15.4    92   12.4 
2026-02-06 00:00 UT   05 46 15.5   +27 03 51     2.072    2.809  130.0   15.6    92   12.4 
2026-02-07 00:00 UT   05 46 01.0   +27 04 45     2.084    2.810  128.9   15.8    92   12.4 
2026-02-08 00:00 UT   05 45 48.4   +27 05 38     2.096    2.812  127.9   16.1    91   12.4 
2026-02-09 00:00 UT   05 45 37.6   +27 06 29     2.109    2.814  126.8   16.3    91   12.4 
2026-02-10 00:00 UT   05 45 28.5   +27 07 20     2.122    2.815  125.8   16.5    91   12.5 
2026-02-11 00:00 UT   05 45 21.3   +27 08 09     2.135    2.817  124.8   16.7    91   12.5 
2026-02-12 00:00 UT   05 45 15.9   +27 08 57     2.148    2.818  123.7   16.9    91   12.5 

    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.