(747) Winchester
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	14 Jul 2025	12.2	2.490 AU	1.769 AU	23h23m	-12°46'	124.5°	19.7°
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
2025-07-14 00:00 UT   23 23 41.3   -12 46 20     1.769    2.490  124.5   19.7   252   12.2 
2025-07-14 22:09 UT   23 24 06.6   -12 53 18     1.757    2.486  125.3   19.5   253   12.2 
2025-07-15 00:00 UT   23 24 08.7   -12 53 53     1.756    2.486  125.3   19.5   253   12.2 
2025-07-16 00:00 UT   23 24 34.9   -13 01 41     1.743    2.483  126.2   19.3   253   12.2 
2025-07-17 00:00 UT   23 24 59.8   -13 09 43     1.730    2.479  127.1   19.1   253   12.2 
2025-07-18 00:00 UT   23 25 23.5   -13 17 60     1.717    2.476  128.0   18.9   253   12.1 
2025-07-19 00:00 UT   23 25 45.8   -13 26 31     1.705    2.472  128.9   18.7   254   12.1 
2025-07-20 00:00 UT   23 26 06.9   -13 35 17     1.692    2.469  129.7   18.4   254   12.1 
2025-07-21 00:00 UT   23 26 26.6   -13 44 18     1.680    2.465  130.6   18.2   255   12.1 
2025-07-22 00:00 UT   23 26 45.0   -13 53 33     1.667    2.462  131.5   18.0   255   12.0 
2025-07-23 00:00 UT   23 27 01.9   -14 03 03     1.655    2.458  132.5   17.8   255   12.0 
2025-07-24 00:00 UT   23 27 17.5   -14 12 48     1.643    2.455  133.4   17.5   256   12.0 
2025-07-25 00:00 UT   23 27 31.7   -14 22 47     1.632    2.451  134.3   17.3   256   12.0 
2025-07-26 00:00 UT   23 27 44.5   -14 33 00     1.620    2.448  135.2   17.0   257   11.9 
2025-07-27 00:00 UT   23 27 55.9   -14 43 28     1.609    2.444  136.1   16.7   257   11.9 
2025-07-28 00:00 UT   23 28 05.9   -14 54 09     1.598    2.441  137.0   16.5   258   11.9 
2025-07-29 00:00 UT   23 28 14.4   -15 05 05     1.587    2.437  138.0   16.2   258   11.8 
2025-07-30 00:00 UT   23 28 21.5   -15 16 14     1.576    2.434  138.9   15.9   259   11.8 
2025-07-31 00:00 UT   23 28 27.1   -15 27 37     1.565    2.430  139.8   15.6   260   11.8 
2025-08-01 00:00 UT   23 28 31.2   -15 39 13     1.555    2.427  140.7   15.3   260   11.8 
2025-08-02 00:00 UT   23 28 33.9   -15 51 02     1.544    2.423  141.7   15.1   261   11.7 
2025-08-03 00:00 UT   23 28 35.1   -16 03 04     1.534    2.420  142.6   14.8   262   11.7 
2025-08-04 00:00 UT   23 28 34.8   -16 15 18     1.524    2.417  143.5   14.5   263   11.7 
2025-08-05 00:00 UT   23 28 33.1   -16 27 44     1.515    2.413  144.5   14.1   264   11.6 
2025-08-06 00:00 UT   23 28 29.9   -16 40 22     1.505    2.410  145.4   13.8   264   11.6 
2025-08-07 00:00 UT   23 28 25.2   -16 53 12     1.496    2.406  146.3   13.5   265   11.6 
2025-08-08 00:00 UT   23 28 19.0   -17 06 12     1.487    2.403  147.2   13.2   266   11.6 
2025-08-09 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 

    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.