C/2016 U1 (NEOWISE)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	9 Dec 2016	10.3	0.887 AU	0.744 AU	15h10m	+30°13'	59.8°	73.7°	329°
Perihelion	9 Jan 2017	6.8	0.320 AU	1.173 AU	18h25m	-19°54'	13.8°	47.0°	281°
Today	11 Jul 2026	32.9	24.940 AU	25.292 AU	03h03m	-04°46'	68.7°	2.2°	244°

The interactive orbit chart above shows the comet'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.)

Light curve

The light curve chart below shows the estimated development of the comet's magnitude. Blue and black dots are visual and photometric CCD observations from COBS. This lightcurve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 11.5 + 5 log[∆] + 10.3 log[r]). An additional green curve is displayed when an increase in apparent brightness is expected due to forward scattering of sunlight, which occurs when a dust-rich comet is located between the Earth and the Sun. (See Marcus 2007)

Charts

The all-sky chart below shows the path of the comet over the same period as the light curve. The comet's current position is marked yellow.

The following chart shows the short-term path of the comet in a field of view that is optimized for (~10x50) binoculars and finderscopes.

Orbital elements

The orbital elements of C/2016 U1 (NEOWISE) are:

    e (Eccentricity)                : 1.0002080
    q (Perihelion distance)         : 0.3199280
    i (Inclination)                 : 46.07620
    Ω (Longitude of ascending node) : 61.77450
    ω (Argument of perihelion)      : 162.55700
    L (Longitude of perihelion)     : 49.47836
    B (Latitude of perihelion)      : 12.46856
    T (Time of perihelion passage)  : 2457763.28640

    Epoch                           : 2026 May 29
    Reference                       : MPC194149

    Classification(s):              : Nearly isotropic; New (a > 10000 AU)

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-07-10 00:00 UT   03 03 05.6   -04 45 37    25.307   24.933   67.3    2.2   243   32.9 
2026-07-11 00:00 UT   03 03 10.1   -04 46 00    25.297   24.938   68.2    2.2   244   32.9 
2026-07-11 13:09 UT   03 03 12.6   -04 46 13    25.292   24.940   68.7    2.2   244   32.9 
2026-07-12 00:00 UT   03 03 14.5   -04 46 25    25.287   24.943   69.0    2.2   244   32.9 
2026-07-13 00:00 UT   03 03 18.8   -04 46 50    25.278   24.948   69.9    2.2   245   32.9 
2026-07-14 00:00 UT   03 03 23.0   -04 47 17    25.268   24.952   70.8    2.2   245   32.9 
2026-07-15 00:00 UT   03 03 27.0   -04 47 44    25.258   24.957   71.7    2.2   245   32.9 
2026-07-16 00:00 UT   03 03 30.9   -04 48 12    25.248   24.962   72.5    2.2   246   32.9 
2026-07-17 00:00 UT   03 03 34.6   -04 48 42    25.238   24.967   73.4    2.2   246   32.9 
2026-07-18 00:00 UT   03 03 38.2   -04 49 12    25.227   24.972   74.3    2.2   246   32.9 
2026-07-19 00:00 UT   03 03 41.7   -04 49 43    25.217   24.977   75.1    2.3   247   32.9 
2026-07-20 00:00 UT   03 03 45.0   -04 50 15    25.207   24.982   76.0    2.3   247   32.9 
2026-07-21 00:00 UT   03 03 48.2   -04 50 48    25.196   24.986   76.9    2.3   248   32.9 

    Terminology:
            
    delta:  distance between comet and earth in AU
    radius: distance between comet 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-comet)    
    phase:  phase angle in degrees (angle sun-comet-earth)        
    AU:     Astronomical Unit (mean distance between earth and sun: 149597870.7 km      
    

Orbital elements usually provided by the MPC (Minor Planet Center).
Observations contributed by observers worldwide, via COBS (Comet Observation Database) or 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.