(313) Chaldaea
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	16 Apr 2026	14.5	2.721 AU	2.672 AU	20h13m	-08°09'	82.0°	21.4°
Opposition	24 Jul 2026	13.1	2.794 AU	1.800 AU	20h03m	-05°08'	165.0°	5.4°

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 Chaldaea are:

            e (Eccentricity)                : 0.1808338
            a (Semimajor axis)              : 2.3756468
            i (Inclination)                 : 11.64375
            Ω (Longitude of ascending node) : 176.53270
            ω (Argument of perihelion)      : 315.73423
            M (Mean anomaly)                : 98.13748
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 132.86222
            B (Latitude of perihelion)      : -8.09830
            P (Orbital period in years)     : 3.66            
        

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
2026-04-16 00:00 UT   20 13 35.5   -08 09 51     2.672    2.721   82.0   21.4   259   14.5 
2026-04-16 22:08 UT   20 14 25.0   -08 04 25     2.661    2.722   82.7   21.5   259   14.5 
2026-04-17 00:00 UT   20 14 29.1   -08 03 57     2.660    2.722   82.8   21.5   258   14.5 
2026-04-18 00:00 UT   20 15 21.7   -07 58 04     2.648    2.723   83.5   21.5   258   14.5 
2026-04-19 00:00 UT   20 16 13.4   -07 52 11     2.636    2.724   84.2   21.5   258   14.5 
2026-04-20 00:00 UT   20 17 04.0   -07 46 19     2.623    2.726   85.0   21.5   258   14.5 
2026-04-21 00:00 UT   20 17 53.7   -07 40 28     2.611    2.727   85.7   21.6   258   14.5 
2026-04-22 00:00 UT   20 18 42.3   -07 34 38     2.599    2.728   86.4   21.6   257   14.5 
2026-04-23 00:00 UT   20 19 30.0   -07 28 50     2.587    2.729   87.2   21.6   257   14.5 
2026-04-24 00:00 UT   20 20 16.6   -07 23 03     2.574    2.730   87.9   21.6   257   14.5 
2026-04-25 00:00 UT   20 21 02.1   -07 17 17     2.562    2.731   88.7   21.6   257   14.4 
2026-04-26 00:00 UT   20 21 46.7   -07 11 33     2.550    2.732   89.4   21.6   256   14.4 
2026-04-27 00:00 UT   20 22 30.1   -07 05 51     2.537    2.732   90.2   21.6   256   14.4 
2026-04-28 00:00 UT   20 23 12.5   -07 00 10     2.525    2.733   90.9   21.6   256   14.4 
2026-04-29 00:00 UT   20 23 53.9   -06 54 31     2.513    2.734   91.7   21.6   256   14.4 
2026-04-30 00:00 UT   20 24 34.1   -06 48 55     2.500    2.735   92.5   21.6   256   14.4 
2026-05-01 00:00 UT   20 25 13.2   -06 43 20     2.488    2.736   93.2   21.6   255   14.4 
2026-05-02 00:00 UT   20 25 51.2   -06 37 48     2.476    2.737   94.0   21.5   255   14.4 
2026-05-03 00:00 UT   20 26 28.1   -06 32 18     2.463    2.738   94.8   21.5   255   14.4 
2026-05-04 00:00 UT   20 27 03.9   -06 26 50     2.451    2.739   95.6   21.5   255   14.4 
2026-05-05 00:00 UT   20 27 38.5   -06 21 26     2.439    2.740   96.3   21.5   254   14.3 
2026-05-06 00:00 UT   20 28 11.9   -06 16 04     2.427    2.741   97.1   21.4   254   14.3 
2026-05-07 00:00 UT   20 28 44.1   -06 10 45     2.414    2.742   97.9   21.4   254   14.3 
2026-05-08 00:00 UT   20 29 15.2   -06 05 29     2.402    2.743   98.7   21.3   254   14.3 
2026-05-09 00:00 UT   20 29 45.0   -06 00 16     2.390    2.744   99.5   21.3   254   14.3 
2026-05-10 00:00 UT   20 30 13.7   -05 55 07     2.378    2.745  100.3   21.2   253   14.3 
2026-05-11 00:00 UT   20 30 41.1   -05 50 01     2.366    2.746  101.1   21.2   253   14.3 
2026-05-12 00:00 UT   20 31 07.2   -05 44 59     2.353    2.746  101.9   21.1   253   14.3 
2026-05-13 00:00 UT   20 31 32.1   -05 40 00     2.341    2.747  102.8   21.0   253   14.2 
2026-05-14 00:00 UT   20 31 55.7   -05 35 06     2.329    2.748  103.6   20.9   252   14.2 
2026-05-15 00:00 UT   20 32 18.0   -05 30 16     2.317    2.749  104.4   20.9   252   14.2 
2026-05-16 00:00 UT   20 32 39.0   -05 25 30     2.305    2.750  105.2   20.8   252   14.2 

    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.