(385) Ilmatar
ephemeris date magn radius delta ra dec elong phase
Opposition9 Apr 202411.22.518 AU1.533 AU12h55m-20°14'166.8°5.2°
Today21 May 202412.02.547 AU1.754 AU12h28m-18°47'132.3°17.1°
(385) Ilmatar - 2024-05-21
astro.vanbuitenen.nl


 
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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 Ilmatar are:

            e (Eccentricity)                : 0.1265337
            a (Semimajor axis)              : 2.8476424
            i (Inclination)                 : 13.58079
            Ω (Longitude of ascending node) : 344.85535
            ω (Argument of perihelion)      : 189.11871
            M (Mean anomaly)                : 19.08072
            Epoch                           : 2024 Mar 31

            L (Longitude of perihelion)     : 353.72321
            B (Latitude of perihelion)      : -2.13269
            P (Orbital period in years)     : 4.81            
        

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. 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
2024-05-21 00:00 UT   12 28 26.0   -18 47 54     1.754    2.547  132.3   17.1   101   12.0 
2024-05-21 10:57 UT   12 28 23.0   -18 47 09     1.758    2.548  131.8   17.2   101   12.0 
2024-05-22 00:00 UT   12 28 19.8   -18 46 17     1.764    2.548  131.3   17.4   101   12.0 
2024-05-23 00:00 UT   12 28 15.3   -18 44 45     1.773    2.549  130.4   17.6   101   12.0 
2024-05-24 00:00 UT   12 28 12.4   -18 43 19     1.783    2.550  129.5   17.9   102   12.1 
2024-05-25 00:00 UT   12 28 11.3   -18 41 59     1.793    2.551  128.5   18.1   102   12.1 
2024-05-26 00:00 UT   12 28 11.8   -18 40 45     1.803    2.551  127.6   18.3   103   12.1 
2024-05-27 00:00 UT   12 28 13.9   -18 39 37     1.814    2.552  126.7   18.6   103   12.1 
2024-05-28 00:00 UT   12 28 17.8   -18 38 35     1.824    2.553  125.8   18.8   103   12.2 
2024-05-29 00:00 UT   12 28 23.2   -18 37 40     1.835    2.554  124.9   19.0   104   12.2 
2024-05-30 00:00 UT   12 28 30.2   -18 36 51     1.845    2.555  124.0   19.2   104   12.2 
2024-05-31 00:00 UT   12 28 38.9   -18 36 08     1.856    2.556  123.1   19.4   104   12.2 
2024-06-01 00:00 UT   12 28 49.1   -18 35 32     1.867    2.556  122.3   19.6   105   12.2 
2024-06-02 00:00 UT   12 29 01.0   -18 35 03     1.878    2.557  121.4   19.8   105   12.3 
2024-06-03 00:00 UT   12 29 14.4   -18 34 41     1.889    2.558  120.5   20.0   105   12.3 
2024-06-04 00:00 UT   12 29 29.3   -18 34 25     1.900    2.559  119.7   20.2   106   12.3 
2024-06-05 00:00 UT   12 29 45.8   -18 34 17     1.912    2.560  118.8   20.3   106   12.3 
2024-06-06 00:00 UT   12 30 03.8   -18 34 15     1.923    2.561  118.0   20.5   106   12.3 
2024-06-07 00:00 UT   12 30 23.4   -18 34 21     1.935    2.562  117.1   20.7   107   12.3 
2024-06-08 00:00 UT   12 30 44.4   -18 34 34     1.946    2.562  116.3   20.8   107   12.4 
2024-06-09 00:00 UT   12 31 06.9   -18 34 54     1.958    2.563  115.4   21.0   107   12.4 
2024-06-10 00:00 UT   12 31 30.8   -18 35 21     1.970    2.564  114.6   21.1   107   12.4 
2024-06-11 00:00 UT   12 31 56.2   -18 35 55     1.981    2.565  113.8   21.2   108   12.4 
2024-06-12 00:00 UT   12 32 23.0   -18 36 37     1.993    2.566  113.0   21.4   108   12.4 
2024-06-13 00:00 UT   12 32 51.2   -18 37 25     2.005    2.567  112.1   21.5   108   12.5 
2024-06-14 00:00 UT   12 33 20.8   -18 38 21     2.018    2.568  111.3   21.6   108   12.5 
2024-06-15 00:00 UT   12 33 51.7   -18 39 24     2.030    2.569  110.5   21.7   109   12.5 
2024-06-16 00:00 UT   12 34 24.0   -18 40 34     2.042    2.570  109.7   21.8   109   12.5 
2024-06-17 00:00 UT   12 34 57.6   -18 41 51     2.054    2.570  108.9   22.0   109   12.5 
2024-06-18 00:00 UT   12 35 32.5   -18 43 15     2.067    2.571  108.2   22.1   109   12.5 
2024-06-19 00:00 UT   12 36 08.6   -18 44 47     2.079    2.572  107.4   22.1   109   12.6 
2024-06-20 00:00 UT   12 36 46.0   -18 46 25     2.092    2.573  106.6   22.2   110   12.6 


    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.