(132) Aethra
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	17 Sep 2025	14.6	3.080 AU	2.847 AU	17h51m	-09°31'	93.7°	19.0°
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. 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
2025-09-17 00:00 UT   17 51 18.0   -09 31 42     2.847    3.080   93.7   19.0    92   14.6 
2025-09-17 03:16 UT   17 51 22.8   -09 31 47     2.850    3.080   93.6   19.0    92   14.6 
2025-09-18 00:00 UT   17 51 53.8   -09 32 22     2.864    3.083   92.9   19.0    92   14.7 
2025-09-19 00:00 UT   17 52 30.5   -09 33 02     2.882    3.086   92.1   19.0    91   14.7 
2025-09-20 00:00 UT   17 53 08.1   -09 33 42     2.899    3.089   91.3   19.0    91   14.7 
2025-09-21 00:00 UT   17 53 46.7   -09 34 21     2.916    3.092   90.5   19.0    91   14.7 
2025-09-22 00:00 UT   17 54 26.2   -09 35 00     2.933    3.095   89.7   18.9    90   14.7 
2025-09-23 00:00 UT   17 55 06.5   -09 35 39     2.950    3.098   88.9   18.9    90   14.7 
2025-09-24 00:00 UT   17 55 47.8   -09 36 16     2.967    3.101   88.1   18.9    90   14.7 
2025-09-25 00:00 UT   17 56 29.9   -09 36 53     2.984    3.104   87.4   18.8    90   14.8 
2025-09-26 00:00 UT   17 57 12.8   -09 37 29     3.001    3.107   86.6   18.8    89   14.8 
2025-09-27 00:00 UT   17 57 56.6   -09 38 04     3.018    3.110   85.8   18.8    89   14.8 
2025-09-28 00:00 UT   17 58 41.2   -09 38 38     3.035    3.113   85.0   18.7    89   14.8 
2025-09-29 00:00 UT   17 59 26.6   -09 39 11     3.052    3.116   84.3   18.7    89   14.8 
2025-09-30 00:00 UT   18 00 12.8   -09 39 43     3.069    3.119   83.5   18.6    88   14.8 
2025-10-01 00:00 UT   18 00 59.8   -09 40 13     3.086    3.122   82.7   18.6    88   14.8 
2025-10-02 00:00 UT   18 01 47.5   -09 40 42     3.103    3.125   82.0   18.5    88   14.8 
2025-10-03 00:00 UT   18 02 36.0   -09 41 10     3.120    3.128   81.2   18.4    88   14.9 
2025-10-04 00:00 UT   18 03 25.2   -09 41 36     3.137    3.131   80.5   18.4    87   14.9 
2025-10-05 00:00 UT   18 04 15.1   -09 42 00     3.154    3.134   79.7   18.3    87   14.9 
2025-10-06 00:00 UT   18 05 05.8   -09 42 23     3.171    3.137   79.0   18.2    87   14.9 
2025-10-07 00:00 UT   18 05 57.1   -09 42 44     3.187    3.140   78.2   18.2    86   14.9 
2025-10-08 00:00 UT   18 06 49.1   -09 43 03     3.204    3.143   77.5   18.1    86   14.9 
2025-10-09 00:00 UT   18 07 41.7   -09 43 21     3.221    3.146   76.7   18.0    86   14.9 
2025-10-10 00:00 UT   18 08 35.0   -09 43 36     3.237    3.149   76.0   17.9    86   14.9 
2025-10-11 00:00 UT   18 09 29.0   -09 43 49     3.254    3.151   75.3   17.8    85   14.9 
2025-10-12 00:00 UT   18 10 23.6   -09 44 01     3.270    3.154   74.5   17.8    85   15.0 
2025-10-13 00:00 UT   18 11 18.8   -09 44 10     3.287    3.157   73.8   17.7    85   15.0 
2025-10-14 00:00 UT   18 12 14.7   -09 44 17     3.303    3.160   73.1   17.6    85   15.0 
2025-10-15 00:00 UT   18 13 11.1   -09 44 22     3.319    3.163   72.3   17.5    84   15.0 
2025-10-16 00:00 UT   18 14 08.1   -09 44 24     3.336    3.166   71.6   17.4    84   15.0 
2025-10-17 00:00 UT   18 15 05.8   -09 44 25     3.352    3.169   70.9   17.3    84   15.0 

    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.