(747) Winchester
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	31 Aug 2025	11.0	2.326 AU	1.342 AU	23h19m	-22°34'	162.8°	7.4°
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
2025-08-31 00:00 UT   23 19 33.1   -22 34 56     1.342    2.326  162.8    7.4   322   11.0 
2025-08-31 08:48 UT   23 19 19.7   -22 40 13     1.341    2.325  162.8    7.4   323   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 
2025-09-08 00:00 UT   23 14 20.3   -24 26 00     1.323    2.300  161.3    8.1   353   11.0 
2025-09-09 00:00 UT   23 13 39.0   -24 39 07     1.322    2.297  160.8    8.3   357   11.0 
2025-09-10 00:00 UT   23 12 57.4   -24 52 00     1.321    2.294  160.2    8.6   360   11.0 
2025-09-11 00:00 UT   23 12 15.6   -25 04 40     1.320    2.290  159.6    8.8     3   11.0 
2025-09-12 00:00 UT   23 11 33.7   -25 17 05     1.319    2.287  158.9    9.1     6   11.0 
2025-09-13 00:00 UT   23 10 51.6   -25 29 16     1.319    2.284  158.2    9.4     9   11.0 
2025-09-14 00:00 UT   23 10 09.6   -25 41 10     1.319    2.281  157.5    9.7    11   11.1 
2025-09-15 00:00 UT   23 09 27.6   -25 52 49     1.319    2.278  156.7   10.1    14   11.1 
2025-09-16 00:00 UT   23 08 45.9   -26 04 10     1.320    2.275  155.9   10.4    16   11.1 
2025-09-17 00:00 UT   23 08 04.3   -26 15 13     1.320    2.272  155.1   10.8    18   11.1 
2025-09-18 00:00 UT   23 07 23.0   -26 25 59     1.321    2.269  154.2   11.1    20   11.1 
2025-09-19 00:00 UT   23 06 42.2   -26 36 25     1.322    2.265  153.3   11.5    22   11.1 
2025-09-20 00:00 UT   23 06 01.8   -26 46 32     1.324    2.262  152.5   11.8    24   11.1 
2025-09-21 00:00 UT   23 05 21.9   -26 56 20     1.325    2.259  151.6   12.2    25   11.1 
2025-09-22 00:00 UT   23 04 42.7   -27 05 47     1.327    2.256  150.6   12.6    27   11.2 
2025-09-23 00:00 UT   23 04 04.1   -27 14 54     1.329    2.253  149.7   13.0    28   11.2 
2025-09-24 00:00 UT   23 03 26.4   -27 23 40     1.331    2.250  148.8   13.4    30   11.2 
2025-09-25 00:00 UT   23 02 49.4   -27 32 04     1.334    2.247  147.8   13.7    31   11.2 
2025-09-26 00:00 UT   23 02 13.5   -27 40 08     1.336    2.244  146.9   14.1    32   11.2 
2025-09-27 00:00 UT   23 01 38.4   -27 47 49     1.339    2.241  145.9   14.5    34   11.2 
2025-09-28 00:00 UT   23 01 04.5   -27 55 08     1.342    2.238  145.0   14.9    35   11.2 
2025-09-29 00:00 UT   23 00 31.6   -28 02 06     1.345    2.235  144.0   15.3    36   11.3 
2025-09-30 00:00 UT   22 59 60.0   -28 08 41     1.349    2.232  143.1   15.6    37   11.3 

    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.