(313) Chaldaea
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	2 Oct 2025	14.4	2.413 AU	3.160 AU	14h52m	-08°24'	35.3°	13.9°
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. 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
2025-10-02 00:00 UT   14 52 31.9   -08 24 38     3.160    2.413   35.3   13.9    96   14.4 
2025-10-02 20:33 UT   14 54 02.9   -08 31 16     3.167    2.415   34.8   13.7    96   14.4 
2025-10-03 00:00 UT   14 54 18.2   -08 32 23     3.169    2.415   34.8   13.7    96   14.4 
2025-10-04 00:00 UT   14 56 04.7   -08 40 05     3.177    2.417   34.3   13.5    95   14.4 
2025-10-05 00:00 UT   14 57 51.3   -08 47 44     3.186    2.419   33.8   13.3    95   14.4 
2025-10-06 00:00 UT   14 59 38.1   -08 55 19     3.194    2.421   33.3   13.1    95   14.4 
2025-10-07 00:00 UT   15 01 25.0   -09 02 51     3.203    2.423   32.7   12.9    94   14.4 
2025-10-08 00:00 UT   15 03 12.1   -09 10 19     3.211    2.425   32.2   12.7    94   14.4 
2025-10-09 00:00 UT   15 04 59.4   -09 17 43     3.219    2.427   31.7   12.5    93   14.4 
2025-10-10 00:00 UT   15 06 46.8   -09 25 04     3.227    2.429   31.2   12.3    93   14.4 
2025-10-11 00:00 UT   15 08 34.4   -09 32 21     3.235    2.431   30.7   12.1    93   14.4 
2025-10-12 00:00 UT   15 10 22.2   -09 39 34     3.243    2.433   30.2   11.9    92   14.4 
2025-10-13 00:00 UT   15 12 10.1   -09 46 44     3.251    2.435   29.7   11.7    92   14.4 
2025-10-14 00:00 UT   15 13 58.2   -09 53 49     3.258    2.437   29.2   11.5    91   14.4 
2025-10-15 00:00 UT   15 15 46.4   -10 00 51     3.266    2.439   28.7   11.3    91   14.4 
2025-10-16 00:00 UT   15 17 34.8   -10 07 49     3.273    2.441   28.2   11.1    90   14.4 
2025-10-17 00:00 UT   15 19 23.3   -10 14 43     3.281    2.442   27.7   10.9    90   14.4 
2025-10-18 00:00 UT   15 21 12.0   -10 21 32     3.288    2.444   27.2   10.7    89   14.4 
2025-10-19 00:00 UT   15 23 00.8   -10 28 18     3.295    2.446   26.7   10.5    89   14.4 
2025-10-20 00:00 UT   15 24 49.8   -10 34 59     3.302    2.448   26.2   10.3    88   14.4 

    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.