(385) Ilmatar
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	13 Dec 2025	13.9	3.161 AU	3.656 AU	21h08m	-20°01'	52.9°	14.4°
Opposition	8 Oct 2026	12.3	3.175 AU	2.187 AU	00h40m	+15°28'	169.8°	3.2°

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)                : 0.1269207
            a (Semimajor axis)              : 2.8476064
            i (Inclination)                 : 13.58186
            Ω (Longitude of ascending node) : 344.83444
            ω (Argument of perihelion)      : 189.10318
            M (Mean anomaly)                : 142.13283
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 353.68714
            B (Latitude of perihelion)      : -2.12925
            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.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-12-13 00:00 UT   21 08 45.6   -20 01 04     3.656    3.161   52.9   14.4    76   13.9 
2025-12-13 09:04 UT   21 09 12.5   -19 58 07     3.661    3.162   52.6   14.3    76   13.9 
2025-12-14 00:00 UT   21 09 56.9   -19 53 15     3.668    3.162   52.2   14.2    76   13.9 
2025-12-15 00:00 UT   21 11 08.5   -19 45 24     3.681    3.163   51.5   14.1    76   13.9 
2025-12-16 00:00 UT   21 12 20.4   -19 37 31     3.692    3.163   50.8   13.9    75   13.9 
2025-12-17 00:00 UT   21 13 32.6   -19 29 36     3.704    3.164   50.1   13.8    75   13.9 
2025-12-18 00:00 UT   21 14 45.1   -19 21 39     3.716    3.164   49.3   13.6    75   13.9 
2025-12-19 00:00 UT   21 15 57.8   -19 13 40     3.728    3.165   48.6   13.5    75   13.9 
2025-12-20 00:00 UT   21 17 10.9   -19 05 39     3.739    3.165   47.9   13.3    75   13.9 
2025-12-21 00:00 UT   21 18 24.2   -18 57 36     3.750    3.166   47.2   13.2    75   13.9 
2025-12-22 00:00 UT   21 19 37.8   -18 49 31     3.762    3.166   46.5   13.0    75   13.9 
2025-12-23 00:00 UT   21 20 51.7   -18 41 24     3.773    3.167   45.8   12.9    75   13.9 
2025-12-24 00:00 UT   21 22 05.7   -18 33 16     3.784    3.168   45.1   12.7    75   13.9 
2025-12-25 00:00 UT   21 23 20.0   -18 25 05     3.795    3.168   44.4   12.6    75   13.9 
2025-12-26 00:00 UT   21 24 34.6   -18 16 52     3.805    3.169   43.7   12.4    75   13.9 
2025-12-27 00:00 UT   21 25 49.3   -18 08 38     3.816    3.169   43.1   12.2    75   13.9 
2025-12-28 00:00 UT   21 27 04.3   -18 00 21     3.826    3.170   42.4   12.1    75   13.9 
2025-12-29 00:00 UT   21 28 19.4   -17 52 03     3.837    3.170   41.7   11.9    75   13.9 
2025-12-30 00:00 UT   21 29 34.8   -17 43 43     3.847    3.171   41.0   11.7    75   13.9 
2025-12-31 00:00 UT   21 30 50.3   -17 35 21     3.857    3.171   40.3   11.6    75   13.9 
2026-01-01 00:00 UT   21 32 06.0   -17 26 57     3.867    3.172   39.6   11.4    75   13.9 
2026-01-02 00:00 UT   21 33 21.9   -17 18 31     3.877    3.172   38.9   11.2    75   13.9 
2026-01-03 00:00 UT   21 34 38.0   -17 10 03     3.886    3.173   38.2   11.1    75   13.9 
2026-01-04 00:00 UT   21 35 54.2   -17 01 34     3.896    3.173   37.5   10.9    75   13.9 
2026-01-05 00:00 UT   21 37 10.5   -16 53 03     3.905    3.174   36.8   10.7    75   13.9 
2026-01-06 00:00 UT   21 38 27.0   -16 44 30     3.915    3.174   36.2   10.5    75   13.9 
2026-01-07 00:00 UT   21 39 43.7   -16 35 55     3.924    3.175   35.5   10.4    74   13.9 
2026-01-08 00:00 UT   21 41 00.5   -16 27 18     3.933    3.175   34.8   10.2    74   13.9 

    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.