(132) Aethra
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Opposition	25 Jun 2025	12.8	2.791 AU	1.788 AU	18h16m	-11°57'	168.6°	4.1°
Today	4 Jul 2025	13.0	2.823 AU	1.832 AU	18h07m	-11°08'	164.1°	5.7°

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)                : 0.3869118
            a (Semimajor axis)              : 2.6120482
            i (Inclination)                 : 24.98457
            Ω (Longitude of ascending node) : 258.05237
            ω (Argument of perihelion)      : 255.61559
            M (Mean anomaly)                : 66.38221
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : 332.25384
            B (Latitude of perihelion)      : -24.15039
            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
2025-07-04 00:00 UT   18 07 04.7   -11 08 45     1.832    2.823  164.1    5.7   139   13.0 
2025-07-04 00:52 UT   18 07 02.5   -11 08 34     1.832    2.823  164.1    5.7   139   13.0 
2025-07-05 00:00 UT   18 06 02.5   -11 03 40     1.838    2.827  163.3    5.9   136   13.0 
2025-07-06 00:00 UT   18 05 01.2   -10 58 42     1.845    2.831  162.4    6.2   133   13.0 
2025-07-07 00:00 UT   18 04 00.8   -10 53 53     1.852    2.835  161.4    6.6   131   13.1 
2025-07-08 00:00 UT   18 03 01.5   -10 49 11     1.860    2.838  160.5    6.9   129   13.1 
2025-07-09 00:00 UT   18 02 03.1   -10 44 37     1.867    2.842  159.5    7.2   127   13.1 
2025-07-10 00:00 UT   18 01 05.9   -10 40 11     1.875    2.846  158.5    7.5   125   13.1 
2025-07-11 00:00 UT   18 00 09.8   -10 35 53     1.883    2.849  157.6    7.8   123   13.2 
2025-07-12 00:00 UT   17 59 14.8   -10 31 43     1.892    2.853  156.5    8.2   122   13.2 
2025-07-13 00:00 UT   17 58 21.1   -10 27 41     1.900    2.857  155.5    8.5   121   13.2 
2025-07-14 00:00 UT   17 57 28.5   -10 23 46     1.909    2.860  154.5    8.8   119   13.2 
2025-07-15 00:00 UT   17 56 37.2   -10 19 59     1.918    2.864  153.5    9.1   118   13.3 
2025-07-16 00:00 UT   17 55 47.2   -10 16 21     1.928    2.867  152.4    9.4   117   13.3 
2025-07-17 00:00 UT   17 54 58.5   -10 12 50     1.937    2.871  151.4    9.8   116   13.3 
2025-07-18 00:00 UT   17 54 11.2   -10 09 26     1.947    2.875  150.3   10.1   115   13.4 
2025-07-19 00:00 UT   17 53 25.2   -10 06 11     1.957    2.878  149.3   10.4   114   13.4 
2025-07-20 00:00 UT   17 52 40.6   -10 03 03     1.968    2.882  148.3   10.7   113   13.4 
2025-07-21 00:00 UT   17 51 57.4   -10 00 03     1.978    2.886  147.2   11.0   113   13.4 
2025-07-22 00:00 UT   17 51 15.6   -09 57 10     1.989    2.889  146.2   11.3   112   13.5 
2025-07-23 00:00 UT   17 50 35.3   -09 54 25     2.000    2.893  145.1   11.6   111   13.5 
2025-07-24 00:00 UT   17 49 56.5   -09 51 48     2.011    2.896  144.1   11.9   110   13.5 
2025-07-25 00:00 UT   17 49 19.2   -09 49 17     2.023    2.900  143.1   12.2   110   13.5 
2025-07-26 00:00 UT   17 48 43.3   -09 46 54     2.035    2.903  142.0   12.4   109   13.6 
2025-07-27 00:00 UT   17 48 09.0   -09 44 38     2.047    2.907  141.0   12.7   109   13.6 
2025-07-28 00:00 UT   17 47 36.2   -09 42 29     2.059    2.910  140.0   13.0   108   13.6 
2025-07-29 00:00 UT   17 47 05.0   -09 40 26     2.071    2.914  139.0   13.2   108   13.6 
2025-07-30 00:00 UT   17 46 35.3   -09 38 31     2.083    2.918  137.9   13.5   107   13.7 
2025-07-31 00:00 UT   17 46 07.1   -09 36 42     2.096    2.921  136.9   13.7   107   13.7 
2025-08-01 00:00 UT   17 45 40.5   -09 34 59     2.109    2.925  135.9   14.0   106   13.7 
2025-08-02 00:00 UT   17 45 15.4   -09 33 23     2.122    2.928  134.9   14.2   106   13.7 
2025-08-03 00:00 UT   17 44 51.9   -09 31 53     2.135    2.931  133.9   14.4   105   13.8 

    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.