(313) Chaldaea
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Opposition	16 Mar 2025	10.9	2.034 AU	1.039 AU	11h48m	+01°10'	178.9°	0.5°
Today	9 May 2025	12.7	2.122 AU	1.402 AU	11h35m	+08°41'	122.4°	23.7°

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)                : 0.1808084
            a (Semimajor axis)              : 2.3753201
            i (Inclination)                 : 11.64441
            Ω (Longitude of ascending node) : 176.53710
            ω (Argument of perihelion)      : 315.68822
            M (Mean anomaly)                : 44.34067
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : 132.82071
            B (Latitude of perihelion)      : -8.10547
            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
2025-05-09 00:00 UT   11 35 06.3   +08 41 50     1.402    2.122  122.4   23.7   117   12.7 
2025-05-09 06:36 UT   11 35 13.8   +08 42 04     1.405    2.122  122.1   23.8   117   12.7 
2025-05-10 00:00 UT   11 35 34.1   +08 42 35     1.413    2.123  121.5   23.9   117   12.7 
2025-05-11 00:00 UT   11 36 03.3   +08 43 05     1.424    2.125  120.7   24.1   117   12.7 
2025-05-12 00:00 UT   11 36 34.0   +08 43 19     1.436    2.127  119.8   24.3   117   12.8 
2025-05-13 00:00 UT   11 37 06.1   +08 43 19     1.447    2.129  119.0   24.5   117   12.8 
2025-05-14 00:00 UT   11 37 39.7   +08 43 05     1.459    2.131  118.1   24.7   117   12.8 
2025-05-15 00:00 UT   11 38 14.6   +08 42 36     1.470    2.133  117.3   24.9   116   12.8 
2025-05-16 00:00 UT   11 38 50.9   +08 41 54     1.482    2.134  116.5   25.1   116   12.9 
2025-05-17 00:00 UT   11 39 28.5   +08 40 57     1.494    2.136  115.7   25.2   116   12.9 
2025-05-18 00:00 UT   11 40 07.5   +08 39 48     1.506    2.138  114.9   25.4   116   12.9 
2025-05-19 00:00 UT   11 40 47.8   +08 38 25     1.518    2.140  114.1   25.6   116   12.9 
2025-05-20 00:00 UT   11 41 29.4   +08 36 49     1.530    2.142  113.3   25.7   116   13.0 
2025-05-21 00:00 UT   11 42 12.2   +08 35 01     1.542    2.144  112.5   25.9   116   13.0 
2025-05-22 00:00 UT   11 42 56.2   +08 32 59     1.554    2.146  111.7   26.0   116   13.0 
2025-05-23 00:00 UT   11 43 41.5   +08 30 46     1.566    2.148  111.0   26.1   116   13.0 
2025-05-24 00:00 UT   11 44 28.0   +08 28 21     1.578    2.149  110.2   26.2   116   13.0 
2025-05-25 00:00 UT   11 45 15.7   +08 25 43     1.591    2.151  109.4   26.4   116   13.1 
2025-05-26 00:00 UT   11 46 04.5   +08 22 54     1.603    2.153  108.7   26.5   116   13.1 
2025-05-27 00:00 UT   11 46 54.5   +08 19 54     1.615    2.155  107.9   26.6   116   13.1 
2025-05-28 00:00 UT   11 47 45.6   +08 16 42     1.628    2.157  107.2   26.7   116   13.1 
2025-05-29 00:00 UT   11 48 37.8   +08 13 19     1.641    2.159  106.5   26.8   115   13.2 
2025-05-30 00:00 UT   11 49 31.1   +08 09 46     1.653    2.161  105.7   26.8   115   13.2 
2025-05-31 00:00 UT   11 50 25.4   +08 06 02     1.666    2.163  105.0   26.9   115   13.2 
2025-06-01 00:00 UT   11 51 20.8   +08 02 08     1.679    2.165  104.3   27.0   115   13.2 
2025-06-02 00:00 UT   11 52 17.2   +07 58 04     1.691    2.167  103.6   27.1   115   13.2 
2025-06-03 00:00 UT   11 53 14.6   +07 53 50     1.704    2.169  102.9   27.1   115   13.3 
2025-06-04 00:00 UT   11 54 13.0   +07 49 27     1.717    2.171  102.2   27.2   115   13.3 
2025-06-05 00:00 UT   11 55 12.3   +07 44 54     1.730    2.172  101.5   27.2   115   13.3 
2025-06-06 00:00 UT   11 56 12.5   +07 40 12     1.743    2.174  100.8   27.3   115   13.3 
2025-06-07 00:00 UT   11 57 13.7   +07 35 22     1.756    2.176  100.1   27.3   115   13.3 
2025-06-08 00:00 UT   11 58 15.7   +07 30 22     1.769    2.178   99.4   27.4   115   13.4 

    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.