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🌎  Greenwich, United Kingdom [change]

Comet 261P/Larson

Comet 261P/Larson is currently in the constellation of Leo. The current Right Ascension of Comet 261P/Larson is 11h 16m 45s and the Declination is -00° 14’ 10” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current estimated magnitude of Comet 261P/Larson is 29.23 (JPL).

Summary of key facts about Comet 261P/Larson [tip: you can also create a Quick Access page for this data if you access it frequently and would like to have a simpler view]:

11h 16m 45s
-00° 14’ 10”

If you need to access this information frequently for your observations, you can create a simple customized Quick Access page, so that you can easily bookmark it in your browser favorites or add a shortcut to your mobile phones' home screen.

Additional information about Comet 261P/Larson available on TheSkyLive:

Available Resources

Comet 261P/Larson Position and Finder Charts

Below we provide Comet 261P/Larson finder charts showing where the object is right now in the sky with respect to the brightest stars. The first finder chart has a field of view of 50 degrees, while the second one has a field of view of 10 degrees. Click on each finder chart to access a full screen interactive Online Planetarium.

Map showing Comet 261P/Larson in Leo on December, 08 2021
Field of view: 50x30 degrees
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Map showing Comet 261P/Larson in Leo on December, 08 2021
Field of view: 10x6 degrees
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 = visible to the naked eye
 = binocular, brighter than 10th magnitude
= current altitude ≥ 30°   = current altitude < 30°   = below the horizon
Location: Greenwich, United Kingdom [change]

Higher precision deep sky finder chart, 60 arcmin wide, showing where Comet 261P/Larson is right now. Click on the image to see a more detailed fullscreen tracker view.

RA: 11h 16m 45s
Dec: -00° 14’ 10”
Deep sky finder chart for Comet 261P/Larson
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet 261P/Larson?, a page that provides all the information needed to find Comet 261P/Larson in the sky and additional links to sky charts.

Comet 261P/Larson Distance from Earth

The distance of Comet 261P/Larson from Earth is currently 705,016,066 kilometers, equivalent to 4.712741 Astronomical Units. Light takes 39 minutes and 11.6805 seconds to travel from Comet 261P/Larson and arrive to us.

39 minutes and 11.6805 seconds

The following chart shows the distance of Comet 261P/Larson from Earth as a function of time. In the chart the distance data is measured in Astronomical Units and sampled with an interval of 1 day.

Distance of Comet 261P/Larson from Earth between January 2013 and December 2100

The value of the reported distance might be somewhat inaccurate around the times of closest approach for objects passing extremely close to Earth. The value of the distance of 261P/Larson from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest approach of Comet 261P/Larson to Earth

Between January 2013 and December 2100, the closest approach of Comet 261P/Larson to Earth happens on Sat Sep 1 2091 at a distance of 1.072410 Astronomical Units, or 160,430,252 kilometers:

Sat Sep 1 2091

NOTE: values for the closest approach are computed with a sampling interval of 1 day.

Comet 261P/Larson brightness

The current visual magnitude of Comet 261P/Larson is 29.23.


The observed magnitude and coma diameter values are derived from the Comet Observers Database by averaging the values reported in recent observations (more recent than 4 days), when available. The Estimated Magnitude comes from the JPL Horizons ephemerides service and might be inaccurate given the highly dynamic and unpredictable behavior of comets. When available, please refer to the Observed Magnitude value and consider the Estimated Magnitude as a directional indication. We acknowledge with thanks the comet observations from the COBS Comet Observation Database contributed by observers worldwide and used in this table to report recent comet observations.

The following chart is the predicted light curve (visual magnitude as a function of time) of Comet 261P/Larson, according to the most recent ephemerides data. Magnitude data is sampled with a 2 days interval and there might be inaccuracies for objects changing brightness very rapidly during the course of a few days. For comets there could be large discrepancies between the observed and predicted brightness because of their highly dynamic behaviour.

Predicted magnitude of Comet 261P/Larson between January 2013 and December 2100

Comet 261P/Larson rise and set times

Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's Comet 261P/Larson rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 90.2°
Max altitude: 38.3°
Azimuth: 269.8°

The rise and set times are defined as the time at which the upper limb of Comet 261P/Larson touches the horizon, considering the effect of the atmospheric refraction. As the atmospheric conditions cannot be modeled precisely the times reported here should be considered correct with an approximation of few minutes.

Comet 261P/Larson Orbital Elements

The following table lists the orbital elements of Comet 261P/Larson at epoch 09 February 2014 00:00 UTC (JD: 2456698.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.39187691
Orbit inclination i 6.33654627°
Perihelion distance q 2.18415099 AU
326,744,338 km
Aphelion distance Q 4.99910192 AU
747,855,004 km
Semi-major axis a 3.59162646 AU
537,299,671 km
Orbital period period 6.8068 years
2,486.1949 days
Date of perihelion transit Tp 2012-Sep-30 02:25:52
2,456,200.6013 JD
Next perihelion transit 2019-Jul-22 07:06
2,458,686.7962 JD
Argument of perihelion peri 58.97020034636°
Longitude of the ascending node node 298.42573157465°
Mean anomaly M 72.095526584882°
Mean motion n 0.14479959°/day

Visualization of Comet 261P/Larson Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet 261P/Larson with respect of the Sun and the orbits of the major planets. The position of Comet 261P/Larson and the planets along their orbits in this diagram accurately represents the current configuration of the objects in the Solar System. This is an experimental feature and it requires a WebGL enabled browser. Please provide us feedback!

Orbit Diagram of Comet 261P/Larson
View Comet 261P/Larson in the 3D Solar System Simulator

Comet 261P/Larson 15 Days Ephemeris

The following table lists the ephemerides of Comet 261P/Larson computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Comet 261P/Larson in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2021 Dec 01 11h 14m 17s +00° 11’ 58” 29.25 Leo
2021 Dec 02 11h 14m 39s +00° 08’ 29” 29.25 Leo
2021 Dec 03 11h 14m 58s +00° 05’ 02” 29.24 Leo
2021 Dec 04 11h 15m 19s +00° 01’ 40” 29.24 Leo
2021 Dec 05 11h 15m 38s -00° 01’ 37” 29.24 Leo
2021 Dec 06 11h 15m 56s -00° 04’ 53” 29.24 Leo
2021 Dec 07 11h 16m 13s -00° 08’ 04” 29.23 Leo
2021 Dec 08 11h 16m 30s -00° 11’ 12” 29.23 Leo
2021 Dec 09 11h 16m 45s -00° 14’ 14” 29.23 Leo
2021 Dec 10 11h 17m 00s -00° 17’ 14” 29.22 Leo
2021 Dec 11 11h 17m 16s -00° 20’ 09” 29.22 Leo
2021 Dec 12 11h 17m 30s -00° 23’ 00” 29.22 Leo
2021 Dec 13 11h 17m 43s -00° 25’ 47” 29.21 Leo
2021 Dec 14 11h 17m 54s -00° 28’ 31” 29.21 Leo