(42) Isis
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	8 Jun 2025	12.6	2.279 AU	3.194 AU	03h38m	+15°40'	21.3°	9.3°
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)                : 0.2219134
            a (Semimajor axis)              : 2.4424420
            i (Inclination)                 : 8.51130
            Ω (Longitude of ascending node) : 84.16549
            ω (Argument of perihelion)      : 237.27312
            M (Mean anomaly)                : 51.56522
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : 141.14936
            B (Latitude of perihelion)      : -7.15245
            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. 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
2025-06-08 00:00 UT   03 38 42.7   +15 40 59     3.194    2.279   21.3    9.3   247   12.6 
2025-06-08 06:29 UT   03 39 13.9   +15 43 03     3.194    2.280   21.5    9.4   247   12.6 
2025-06-09 00:00 UT   03 40 37.9   +15 48 37     3.193    2.282   21.8    9.5   248   12.6 
2025-06-10 00:00 UT   03 42 32.8   +15 56 11     3.191    2.284   22.3    9.7   248   12.7 
2025-06-11 00:00 UT   03 44 27.6   +16 03 38     3.189    2.287   22.7    9.9   248   12.7 
2025-06-12 00:00 UT   03 46 22.3   +16 10 60     3.187    2.289   23.2   10.1   249   12.7 
2025-06-13 00:00 UT   03 48 16.9   +16 18 16     3.185    2.292   23.7   10.3   249   12.7 
2025-06-14 00:00 UT   03 50 11.3   +16 25 26     3.183    2.294   24.2   10.4   250   12.7 
2025-06-15 00:00 UT   03 52 05.5   +16 32 31     3.181    2.297   24.6   10.6   250   12.7 
2025-06-16 00:00 UT   03 53 59.7   +16 39 30     3.178    2.299   25.1   10.8   250   12.7 
2025-06-17 00:00 UT   03 55 53.6   +16 46 23     3.176    2.302   25.6   11.0   251   12.7 
2025-06-18 00:00 UT   03 57 47.4   +16 53 11     3.173    2.304   26.1   11.2   251   12.7 
2025-06-19 00:00 UT   03 59 41.0   +16 59 53     3.170    2.307   26.5   11.4   251   12.7 
2025-06-20 00:00 UT   04 01 34.5   +17 06 30     3.168    2.309   27.0   11.5   252   12.7 
2025-06-21 00:00 UT   04 03 27.8   +17 13 01     3.165    2.312   27.5   11.7   252   12.7 
2025-06-22 00:00 UT   04 05 20.9   +17 19 26     3.162    2.314   28.0   11.9   253   12.8 
2025-06-23 00:00 UT   04 07 13.8   +17 25 45     3.159    2.317   28.5   12.1   253   12.8 
2025-06-24 00:00 UT   04 09 06.6   +17 31 59     3.156    2.319   29.0   12.3   253   12.8 
2025-06-25 00:00 UT   04 10 59.1   +17 38 07     3.152    2.322   29.5   12.4   253   12.8 
2025-06-26 00:00 UT   04 12 51.5   +17 44 10     3.149    2.324   30.0   12.6   254   12.8 

    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.