C/2019 Y1 (ATLAS) |
ephemeris |
date |
magn |
radius |
delta |
ra |
dec |
elong |
phase |
PA |
Perihelion | 17 Mar 2020 | 8.1 | 0.826 AU | 1.471 AU | 00h09m | +30°46' | 32.4° | 40.2° | 10° |
Nearest approach | 3 May 2020 | 9.8 | 1.195 AU | 1.092 AU | 06h10m | +81°56' | 69.2° | 52.1° | 54° |
Today | 1 Jul 2025 | 32.3 | 15.947 AU | 15.511 AU | 13h27m | -44°12' | 113.7° | 3.3° | 100° |
C/2019 Y1 (ATLAS)- 2025-07-01
astro.vanbuitenen.nl
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/2019 Y1 (ATLAS) are:
e (Eccentricity) : 0.9906280
q (Perihelion distance) : 0.8263990
i (Inclination) : 73.27990
Ω (Longitude of ascending node) : 31.47770
ω (Argument of perihelion) : 57.91520
L (Longitude of perihelion) : 56.12799
B (Latitude of perihelion) : 54.23706
T (Time of perihelion passage) : 2458925.69200
P (Orbital period in years) : 828.01
Epoch : 2025 Jun 30
Reference : MPC119999
Classification(s): : Nearly isotropic; Returning (a < 10000 AU); External (P > 200 years); Liller
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 (13.70 + 5 log[∆] + 10.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 8.48 + 5 log[∆] + 14.82 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
2025-07-01 00:00 UT 13 27 55.1 -44 14 21 15.496 15.943 114.3 3.3 99 32.2
2025-07-01 19:40 UT 13 27 51.3 -44 12 40 15.511 15.947 113.7 3.3 100 32.3
2025-07-02 00:00 UT 13 27 50.5 -44 12 18 15.515 15.948 113.5 3.4 100 32.3
2025-07-03 00:00 UT 13 27 46.2 -44 10 16 15.533 15.954 112.7 3.4 101 32.3
2025-07-04 00:00 UT 13 27 42.3 -44 08 15 15.551 15.960 111.9 3.4 101 32.3
2025-07-05 00:00 UT 13 27 38.7 -44 06 15 15.570 15.965 111.1 3.4 102 32.3
2025-07-06 00:00 UT 13 27 35.4 -44 04 15 15.588 15.971 110.3 3.4 102 32.3
2025-07-07 00:00 UT 13 27 32.4 -44 02 17 15.607 15.977 109.5 3.4 103 32.3
2025-07-08 00:00 UT 13 27 29.8 -44 00 20 15.626 15.982 108.7 3.5 104 32.3
2025-07-09 00:00 UT 13 27 27.5 -43 58 24 15.645 15.988 107.9 3.5 104 32.3
2025-07-10 00:00 UT 13 27 25.6 -43 56 30 15.664 15.993 107.1 3.5 105 32.3
2025-07-11 00:00 UT 13 27 23.9 -43 54 36 15.683 15.999 106.3 3.5 105 32.3
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.