(747) Winchester
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	8 Aug 2025	11.6	2.403 AU	1.487 AU	23h28m	-17°06'	147.2°	13.2°
Opposition	2 Sep 2025	11.0	2.318 AU	1.335 AU	23h17m	-23°10'	162.8°	7.4°

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 Winchester are:

            e (Eccentricity)                : 0.3397760
            a (Semimajor axis)              : 2.9996063
            i (Inclination)                 : 18.22071
            Ω (Longitude of ascending node) : 129.04843
            ω (Argument of perihelion)      : 277.62202
            M (Mean anomaly)                : 303.59704
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : 47.06769
            B (Latitude of perihelion)      : -18.05415
            P (Orbital period in years)     : 5.20            
        

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
2025-08-08 00:00 UT   23 28 19.0   -17 06 12     1.487    2.403  147.2   13.2   266   11.6 
2025-08-08 08:49 UT   23 28 16.4   -17 11 02     1.484    2.402  147.6   13.1   267   11.6 
2025-08-09 00:00 UT   23 28 11.3   -17 19 23     1.478    2.399  148.1   12.9   268   11.5 
2025-08-10 00:00 UT   23 28 02.2   -17 32 45     1.469    2.396  149.0   12.6   269   11.5 
2025-08-11 00:00 UT   23 27 51.6   -17 46 16     1.461    2.393  150.0   12.2   270   11.5 
2025-08-12 00:00 UT   23 27 39.5   -17 59 56     1.453    2.389  150.8   11.9   271   11.5 
2025-08-13 00:00 UT   23 27 25.9   -18 13 46     1.445    2.386  151.7   11.6   273   11.4 
2025-08-14 00:00 UT   23 27 10.9   -18 27 43     1.437    2.382  152.6   11.3   274   11.4 
2025-08-15 00:00 UT   23 26 54.5   -18 41 48     1.430    2.379  153.5   11.0   276   11.4 
2025-08-16 00:00 UT   23 26 36.6   -18 56 01     1.422    2.376  154.3   10.6   277   11.3 
2025-08-17 00:00 UT   23 26 17.2   -19 10 19     1.415    2.372  155.1   10.3   279   11.3 
2025-08-18 00:00 UT   23 25 56.5   -19 24 44     1.408    2.369  156.0   10.0   281   11.3 
2025-08-19 00:00 UT   23 25 34.4   -19 39 13     1.402    2.366  156.7    9.7   283   11.3 
2025-08-20 00:00 UT   23 25 10.9   -19 53 47     1.396    2.362  157.5    9.4   286   11.2 
2025-08-21 00:00 UT   23 24 46.1   -20 08 25     1.389    2.359  158.2    9.2   288   11.2 
2025-08-22 00:00 UT   23 24 20.0   -20 23 05     1.384    2.356  158.9    8.9   291   11.2 
2025-08-23 00:00 UT   23 23 52.6   -20 37 48     1.378    2.352  159.6    8.6   293   11.2 
2025-08-24 00:00 UT   23 23 24.0   -20 52 31     1.373    2.349  160.2    8.4   296   11.2 
2025-08-25 00:00 UT   23 22 54.2   -21 07 15     1.368    2.346  160.7    8.2   300   11.1 
2025-08-26 00:00 UT   23 22 23.3   -21 21 58     1.363    2.342  161.2    8.0   303   11.1 
2025-08-27 00:00 UT   23 21 51.2   -21 36 40     1.358    2.339  161.7    7.8   306   11.1 
2025-08-28 00:00 UT   23 21 18.2   -21 51 20     1.354    2.336  162.1    7.7   310   11.1 
2025-08-29 00:00 UT   23 20 44.1   -22 05 56     1.350    2.332  162.4    7.5   314   11.1 
2025-08-30 00:00 UT   23 20 09.0   -22 20 29     1.346    2.329  162.6    7.4   318   11.0 
2025-08-31 00:00 UT   23 19 33.1   -22 34 56     1.342    2.326  162.8    7.4   322   11.0 
2025-09-01 00:00 UT   23 18 56.3   -22 49 18     1.339    2.323  162.9    7.4   326   11.0 
2025-09-02 00:00 UT   23 18 18.8   -23 03 33     1.336    2.319  162.9    7.4   330   11.0 
2025-09-03 00:00 UT   23 17 40.5   -23 17 41     1.333    2.316  162.8    7.4   334   11.0 
2025-09-04 00:00 UT   23 17 01.5   -23 31 41     1.331    2.313  162.6    7.5   338   11.0 
2025-09-05 00:00 UT   23 16 22.0   -23 45 31     1.328    2.310  162.4    7.6   342   11.0 
2025-09-06 00:00 UT   23 15 41.9   -23 59 12     1.326    2.306  162.1    7.7   346   11.0 
2025-09-07 00:00 UT   23 15 01.3   -24 12 42     1.325    2.303  161.7    7.9   350   11.0 

    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.