C/2014 UN271 (Bernardinelli-Bernstein)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Today	9 May 2025	15.7	15.161 AU	15.237 AU	04h13m	-65°25'	83.8°	3.8°	163°
Perihelion	16 Jan 2031	13.6	10.960 AU	10.833 AU	12h09m	-38°49'	94.8°	5.1°	302°
Nearest approach	5 Apr 2031	13.5	10.968 AU	10.122 AU	11h46m	-35°39'	146.3°	2.9°	31°

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.)

The orbital elements of C/2014 UN271 (Bernardinelli-Bernstein) are:

            e (Eccentricity)                : 1.0041810
            q (Perihelion distance)         : 10.9602470
            i (Inclination)                 : 95.44400
            Ω (Longitude of ascending node) : 189.95790
            ω (Argument of perihelion)      : 326.07920
            L (Longitude of perihelion)     : 193.60853
            B (Latitude of perihelion)      : -33.74718
            T (Time of perihelion passage)  : 2462882.91090

            Epoch                           : 2025 May 08
            Reference                       : MPEC 2025-J08

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

The light curve chart below shows the estimated development of the comet's magnitude. Blue and black dots are visual and photometric CCD observations respectively from COBS or the MPC. The gray curve is based on the absolute magnitude and slope parameter as calculated from the original MPEC, or the latest values provided by the MPC (2.50 + 5 log[∆] + 8.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently -1.98 + 5 log[∆] + 10.00 log[r]).

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.
A more printer-friendly version of the same chart can be found further down this page as well.

The following chart shows the current location of the comet in a smaller, upside-down telescopic field of view.

A printable version of the short-term path of the comet in a field of view that is optimized for (~10x50) binoculars and finderscopes.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-05-09 00:00 UT   04 13 37.9   -65 25 58    15.239   15.162   83.8    3.8   163   15.7 
2025-05-09 06:48 UT   04 13 50.3   -65 25 49    15.237   15.161   83.8    3.8   163   15.7 
2025-05-10 00:00 UT   04 14 21.9   -65 25 25    15.232   15.159   83.9    3.8   164   15.7 
2025-05-11 00:00 UT   04 15 06.1   -65 24 55    15.226   15.155   84.1    3.8   165   15.7 
2025-05-12 00:00 UT   04 15 50.5   -65 24 28    15.220   15.152   84.3    3.8   165   15.7 
2025-05-13 00:00 UT   04 16 35.1   -65 24 04    15.214   15.149   84.4    3.8   166   15.7 
2025-05-14 00:00 UT   04 17 19.8   -65 23 43    15.208   15.146   84.6    3.8   167   15.7 
2025-05-15 00:00 UT   04 18 04.7   -65 23 24    15.202   15.142   84.7    3.8   168   15.7 
2025-05-16 00:00 UT   04 18 49.7   -65 23 09    15.196   15.139   84.9    3.8   169   15.7 
2025-05-17 00:00 UT   04 19 34.9   -65 22 56    15.189   15.136   85.1    3.8   169   15.7 
2025-05-18 00:00 UT   04 20 20.2   -65 22 47    15.183   15.132   85.2    3.8   170   15.7 
2025-05-19 00:00 UT   04 21 05.7   -65 22 40    15.177   15.129   85.4    3.8   171   15.7 

    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.