(132) Aethra
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	28 Dec 2025	15.2	3.350 AU	4.226 AU	19h39m	-07°16'	23.7°	6.8°
Opposition	24 Aug 2026	14.5	3.623 AU	2.730 AU	21h25m	+19°27'	147.3°	8.7°

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 Aethra are:

            e (Eccentricity)                : 0.3870077
            a (Semimajor axis)              : 2.6120811
            i (Inclination)                 : 24.98355
            Ω (Longitude of ascending node) : 258.05085
            ω (Argument of perihelion)      : 255.61885
            M (Mean anomaly)                : 113.06116
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 332.25599
            B (Latitude of perihelion)      : -24.14978
            P (Orbital period in years)     : 4.22            
        

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
2025-12-28 00:00 UT   19 39 44.8   -07 16 56     4.226    3.350   23.7    6.8    46   15.2 
2025-12-28 14:40 UT   19 40 31.5   -07 14 15     4.231    3.351   23.4    6.7    45   15.2 
2025-12-29 00:00 UT   19 41 01.3   -07 12 31     4.233    3.352   23.2    6.6    44   15.2 
2025-12-30 00:00 UT   19 42 17.7   -07 08 02     4.240    3.354   22.7    6.5    43   15.2 
2025-12-31 00:00 UT   19 43 34.2   -07 03 29     4.246    3.356   22.2    6.3    42   15.2 
2026-01-01 00:00 UT   19 44 50.6   -06 58 52     4.253    3.358   21.7    6.2    41   15.2 
2026-01-02 00:00 UT   19 46 07.1   -06 54 11     4.259    3.361   21.2    6.1    39   15.2 
2026-01-03 00:00 UT   19 47 23.5   -06 49 26     4.265    3.363   20.7    5.9    38   15.2 
2026-01-04 00:00 UT   19 48 39.8   -06 44 37     4.271    3.365   20.2    5.8    36   15.2 
2026-01-05 00:00 UT   19 49 56.2   -06 39 45     4.276    3.367   19.7    5.7    35   15.2 
2026-01-06 00:00 UT   19 51 12.5   -06 34 48     4.282    3.369   19.3    5.5    33   15.2 
2026-01-07 00:00 UT   19 52 28.7   -06 29 47     4.287    3.371   18.8    5.4    31   15.2 
2026-01-08 00:00 UT   19 53 44.9   -06 24 42     4.292    3.373   18.4    5.3    29   15.2 
2026-01-09 00:00 UT   19 55 01.1   -06 19 33     4.297    3.375   18.0    5.2    27   15.2 
2026-01-10 00:00 UT   19 56 17.2   -06 14 21     4.302    3.378   17.6    5.1    26   15.2 
2026-01-11 00:00 UT   19 57 33.3   -06 09 04     4.306    3.380   17.3    5.0    24   15.2 
2026-01-12 00:00 UT   19 58 49.2   -06 03 44     4.311    3.382   16.9    4.9    21   15.2 
2026-01-13 00:00 UT   20 00 05.2   -05 58 20     4.315    3.384   16.6    4.8    19   15.2 
2026-01-14 00:00 UT   20 01 21.0   -05 52 51     4.319    3.386   16.3    4.7    17   15.2 
2026-01-15 00:00 UT   20 02 36.8   -05 47 19     4.323    3.388   16.0    4.6    15   15.2 
2026-01-16 00:00 UT   20 03 52.4   -05 41 43     4.326    3.390   15.7    4.5    12   15.2 
2026-01-17 00:00 UT   20 05 08.0   -05 36 03     4.330    3.392   15.5    4.4    10   15.2 
2026-01-18 00:00 UT   20 06 23.5   -05 30 20     4.333    3.394   15.3    4.4     7   15.2 
2026-01-19 00:00 UT   20 07 38.9   -05 24 32     4.336    3.396   15.1    4.3     4   15.2 
2026-01-20 00:00 UT   20 08 54.1   -05 18 41     4.339    3.398   14.9    4.3     2   15.2 
2026-01-21 00:00 UT   20 10 09.3   -05 12 46     4.342    3.400   14.8    4.2   359   15.2 
2026-01-22 00:00 UT   20 11 24.3   -05 06 47     4.345    3.402   14.7    4.2   356   15.2 
2026-01-23 00:00 UT   20 12 39.2   -05 00 45     4.347    3.404   14.7    4.2   354   15.2 

    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.