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Comet 38P/Stephan-Oterma

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Comet 38P/Stephan-Oterma Position

Comet 38P/Stephan-Oterma is currently in the constellation of Leo. The current Right Ascension is 11h 57m 13s and the Declination is +15° 59’ 47”.

11h 57m 13s
+15° 59’ 47”

Simplified sky chart showing where Comet 38P/Stephan-Oterma is right now in the sky with respect to the brightest stars and constellations (see fuillscreen Online Planetarium)

Map showing Comet 38P/Stephan-Oterma in Leo on August, 23 2019
Field of view: 60x30 degrees
View fullscreen
 = visible to the naked eye
 = binocular, brighter than 10th magnitude
= current altitude ≥ 30°   = current altitude < 30°   = below the horizon
Location: Greenwich, United Kingdom [change]

Hihgher precision deep sky finder chart showing where Comet 38P/Stephan-Oterma is right now (view fullscreen)

RA: 11h 57m 13s
Dec: +15° 59’ 47”
Deep sky finder chart for Comet 38P/Stephan-Oterma
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet 38P/Stephan-Oterma?, a page that provides all the information needed to find Comet 38P/Stephan-Oterma in the sky and additional links to sky charts.

Comet 38P/Stephan-Oterma Distance

The distance of Comet 38P/Stephan-Oterma from Earth is currently 662,850,951 kilometers, equivalent to 4.430885 Astronomical Units. Light takes 36 minutes and 51.0328 seconds to travel from Comet 38P/Stephan-Oterma and arrive to us.

36 minutes and 51.0328 seconds

The following chart shows the distance of Comet 38P/Stephan-Oterma 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 38P/Stephan-Oterma 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 38P/Stephan-Oterma from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest approach of Comet 38P/Stephan-Oterma to Earth

Between January 2013 and December 2100 the closest approach of Comet 38P/Stephan-Oterma to Earth happens on Mon Dec 17 2018 at a distance of 0.76572673 Astronomical Units, or 114,551,088 kilometers:

Mon Dec 17 2018

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

Comet 38P/Stephan-Oterma brightness

The current visual magnitude of Comet 38P/Stephan-Oterma is 20.40.


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 behvior 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 38P/Stephan-Oterma, 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 38P/Stephan-Oterma between January 2013 and December 2100

Comet 38P/Stephan-Oterma 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 38P/Stephan-Oterma rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 74.0°
Max altitude: 54.5°
Azimuth: 286.0°
Comet 38P/Stephan-Oterma is above the horizon from Greenwich, United Kingdom

The rise and set times are defined as the time at which the upper limb of Comet 38P/Stephan-Oterma touches the horizon, consideting the effect of the atmospheric refraction. As the atmoshpere conditions cannot be modeled precisely the times reported here should be considered correct with an approximation of few minutes.

Comet 38P/Stephan-Oterma Orbital Elements

The following table lists the orbital elements of Comet 38P/Stephan-Oterma at epoch 13 May 2018 00:00 UTC (JD: 2458252.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.85928368
Orbit inclination i 18.35294581°
Perihelion distance q 1.58849445 AU
237,635,387 km
Aphelion distance Q 20.98876480 AU
3,139,874,529 km
Semi-major axis a 11.28862962 AU
1,688,754,958 km
Orbital period period 37.9300 years
13,853.5241 days
Date of perihelion transit Tp 2018-Nov-10 23:42:38
2,458,433.4879 JD
Next perihelion transit 2056-Oct-15 12:17
2,472,287.0120 JD
Argument of perihelion peri 359.58909106548°
Longitude of the ascending node node 78.000540233091°
Mean anomaly M 355.29681683455°
Mean motion n 0.02598617°/day

Visualization of Comet 38P/Stephan-Oterma Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet 38P/Stephan-Oterma with respect of the Sun and the orbits of the major planets. The position of Comet 38P/Stephan-Oterma 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 38P/Stephan-Oterma
View Comet 38P/Stephan-Oterma in the 3D Solar System Simulator

Comet 38P/Stephan-Oterma 15 Days Ephemeris

The following table lists the ephemerides of Comet 38P/Stephan-Oterma computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Comet 38P/Stephan-Oterma in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2019 Aug 16 11h 48m 05s +17° 08’ 30” 20.26 Leo
2019 Aug 17 11h 49m 17s +16° 59’ 21” 20.27 Leo
2019 Aug 18 11h 50m 30s +16° 50’ 12” 20.29 Leo
2019 Aug 19 11h 51m 42s +16° 41’ 08” 20.31 Leo
2019 Aug 20 11h 52m 54s +16° 32’ 04” 20.33 Leo
2019 Aug 21 11h 54m 06s +16° 23’ 04” 20.35 Leo
2019 Aug 22 11h 55m 18s +16° 14’ 07” 20.37 Leo
2019 Aug 23 11h 56m 30s +16° 05’ 11” 20.39 Leo
2019 Aug 24 11h 57m 42s +15° 56’ 17” 20.40 Leo
2019 Aug 25 11h 58m 53s +15° 47’ 26” 20.42 Coma
2019 Aug 26 12h 00m 03s +15° 38’ 38” 20.44 Coma
2019 Aug 27 12h 01m 15s +15° 29’ 52” 20.46 Coma
2019 Aug 28 12h 02m 26s +15° 21’ 08” 20.47 Coma
2019 Aug 29 12h 03m 38s +15° 12’ 28” 20.49 Coma