Comet 77P/Longmore

Comet 77P/Longmore is currently in the constellation of Hydra. The current Right Ascension of Comet 77P/Longmore is 14h 25m 58s and the Declination is -25° 40’ 41” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current estimated magnitude of Comet 77P/Longmore is 15.61 (JPL) while the latest observed magnitude is 14.4 (COBS).

Today's rise, transit and set times of Comet 77P/Longmore from Greenwich, United Kingdom [change] (all times relative to the local timezone Europe/London):

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.

Available Resources

• Position and finder charts (see also Where is Comet 77P/Longmore?)
• Distance from Earth (see also How far is Comet 77P/Longmore from Earth?)
• When does Comet 77P/Longmore rise and set?
• Brightness (see also How bright is Comet 77P/Longmore?)
• Orbital elements. Detailed information about Comet 77P/Longmore orbital parameters.
• Interactive orbit visualization. 3d visualization showing the orbit of Comet 77P/Longmore with respect to the major Solar System objects.
• 15 days ephemerides. Table showing celestial coordinates and magnitude of Comet 77P/Longmore for the past and next 7 days.
• Interactive sky chart. An online planetarium application that shows where to locate Comet 77P/Longmore in the sky from your location.
• Live position tracker. A high precision sky chart that uses real deep sky imagery to help locate Comet 77P/Longmore with your telescope or on your astrophotographies.

Higher precision deep sky finder chart, 60 arcmin wide, showing where Comet 77P/Longmore is right now. Click on the image to see a more detailed fullscreen tracker view.

Also check out Where is Comet 77P/Longmore?, a page that provides all the information needed to find Comet 77P/Longmore in the sky and additional links to sky charts.

Comet 77P/Longmore Distance from Earth

The distance of Comet 77P/Longmore from Earth is currently 216,870,178 kilometers, equivalent to 1.449688 Astronomical Units. Light takes 12 minutes and 3.4010 seconds to travel from Comet 77P/Longmore and arrive to us.

The following chart shows the distance of Comet 77P/Longmore 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.

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 77P/Longmore from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest Approach of Comet 77P/Longmore to Earth

Between 1 January 2013 and 30 December 2100, the closest approach of Comet 77P/Longmore to Earth happens on Sun Apr 22 2063 at a distance of 1.005949 Astronomical Units, or 150,487,808 kilometers:

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

Comet 77P/Longmore Brightness

The current visual magnitude of Comet 77P/Longmore is 15.61.

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 77P/Longmore, 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.

Visualization of Comet 77P/Longmore Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet 77P/Longmore with respect of the Sun and the orbits of the major planets. The position of Comet 77P/Longmore 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!

Comet 77P/Longmore 15 Days Ephemeris

The following table lists the ephemerides of Comet 77P/Longmore computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Comet 77P/Longmore in our Online Planetarium at the chosen date.

Date	Right AscensionR.A.	DeclinationDec.	MagnitudeMag	Constellation
2023 Mar 24	14h 31m 22s	-23° 59’ 38”	15.69	Libra
2023 Mar 25	14h 30m 48s	-24° 12’ 38”	15.68	Libra
2023 Mar 26	14h 30m 12s	-24° 25’ 35”	15.67	Libra
2023 Mar 27	14h 29m 35s	-24° 38’ 26”	15.66	Libra
2023 Mar 28	14h 28m 54s	-24° 51’ 12”	15.65	Libra
2023 Mar 29	14h 28m 13s	-25° 03’ 52”	15.64	Hydra
2023 Mar 30	14h 27m 29s	-25° 16’ 27”	15.62	Hydra
2023 Mar 31	14h 26m 43s	-25° 28’ 57”	15.61	Hydra
2023 Apr 01	14h 25m 55s	-25° 41’ 17”	15.61	Hydra
2023 Apr 02	14h 25m 05s	-25° 53’ 32”	15.60	Hydra
2023 Apr 03	14h 24m 15s	-26° 05’ 39”	15.59	Hydra
2023 Apr 04	14h 23m 21s	-26° 17’ 39”	15.58	Hydra
2023 Apr 05	14h 22m 27s	-26° 29’ 30”	15.57	Hydra
2023 Apr 06	14h 21m 30s	-26° 41’ 12”	15.56	Hydra