(81) Terpsichore
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	31 Dec 2025	14.9	3.281 AU	3.525 AU	13h54m	-13°41'	67.7°	16.1°
Opposition	21 Apr 2026	13.5	3.398 AU	2.397 AU	13h49m	-17°21'	174.3°	1.7°

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 Terpsichore are:

            e (Eccentricity)                : 0.2117711
            a (Semimajor axis)              : 2.8515286
            i (Inclination)                 : 7.80119
            Ω (Longitude of ascending node) : 0.89514
            ω (Argument of perihelion)      : 51.22361
            M (Mean anomaly)                : 118.66686
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 51.85838
            B (Latitude of perihelion)      : 6.07438
            P (Orbital period in years)     : 4.82            
        

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
2025-12-31 00:00 UT   13 54 40.0   -13 41 41     3.525    3.281   67.7   16.1   290   14.9 
2025-12-31 22:18 UT   13 55 28.3   -13 47 36     3.514    3.283   68.5   16.2   290   14.9 
2026-01-01 00:00 UT   13 55 32.0   -13 48 02     3.513    3.283   68.5   16.2   290   14.9 
2026-01-02 00:00 UT   13 56 23.4   -13 54 20     3.500    3.284   69.3   16.3   290   14.9 
2026-01-03 00:00 UT   13 57 14.1   -14 00 35     3.487    3.285   70.1   16.3   290   14.9 
2026-01-04 00:00 UT   13 58 04.2   -14 06 45     3.474    3.287   70.9   16.4   290   14.9 
2026-01-05 00:00 UT   13 58 53.6   -14 12 53     3.462    3.288   71.7   16.5   290   14.9 
2026-01-06 00:00 UT   13 59 42.3   -14 18 57     3.449    3.289   72.5   16.6   290   14.9 
2026-01-07 00:00 UT   14 00 30.4   -14 24 57     3.436    3.290   73.3   16.6   290   14.8 
2026-01-08 00:00 UT   14 01 17.7   -14 30 54     3.423    3.292   74.1   16.7   290   14.8 
2026-01-09 00:00 UT   14 02 04.4   -14 36 47     3.409    3.293   74.9   16.8   289   14.8 
2026-01-10 00:00 UT   14 02 50.3   -14 42 37     3.396    3.294   75.7   16.8   289   14.8 
2026-01-11 00:00 UT   14 03 35.4   -14 48 23     3.383    3.296   76.5   16.9   289   14.8 
2026-01-12 00:00 UT   14 04 19.8   -14 54 05     3.370    3.297   77.3   16.9   289   14.8 
2026-01-13 00:00 UT   14 05 03.5   -14 59 43     3.356    3.298   78.2   17.0   289   14.8 
2026-01-14 00:00 UT   14 05 46.3   -15 05 18     3.343    3.299   79.0   17.0   289   14.8 
2026-01-15 00:00 UT   14 06 28.4   -15 10 49     3.329    3.301   79.8   17.1   289   14.8 
2026-01-16 00:00 UT   14 07 09.6   -15 16 16     3.316    3.302   80.6   17.1   289   14.8 
2026-01-17 00:00 UT   14 07 50.1   -15 21 39     3.302    3.303   81.5   17.1   289   14.8 
2026-01-18 00:00 UT   14 08 29.6   -15 26 58     3.289    3.304   82.3   17.2   289   14.8 
2026-01-19 00:00 UT   14 09 08.4   -15 32 13     3.275    3.306   83.2   17.2   289   14.8 
2026-01-20 00:00 UT   14 09 46.2   -15 37 24     3.261    3.307   84.0   17.2   289   14.8 
2026-01-21 00:00 UT   14 10 23.2   -15 42 31     3.248    3.308   84.9   17.2   289   14.8 
2026-01-22 00:00 UT   14 10 59.3   -15 47 34     3.234    3.309   85.7   17.3   289   14.7 
2026-01-23 00:00 UT   14 11 34.4   -15 52 33     3.220    3.310   86.6   17.3   289   14.7 
2026-01-24 00:00 UT   14 12 08.7   -15 57 27     3.206    3.312   87.4   17.3   289   14.7 
2026-01-25 00:00 UT   14 12 42.0   -16 02 18     3.193    3.313   88.3   17.3   289   14.7 
2026-01-26 00:00 UT   14 13 14.3   -16 07 04     3.179    3.314   89.2   17.3   289   14.7 
2026-01-27 00:00 UT   14 13 45.7   -16 11 46     3.165    3.315   90.0   17.3   289   14.7 
2026-01-28 00:00 UT   14 14 16.1   -16 16 24     3.151    3.316   90.9   17.3   289   14.7 
2026-01-29 00:00 UT   14 14 45.6   -16 20 57     3.138    3.318   91.8   17.3   289   14.7 
2026-01-30 00:00 UT   14 15 14.0   -16 25 27     3.124    3.319   92.7   17.2   289   14.7 

    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.