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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 10h 33m 09s and the Declination is +27° 06’ 26”.

10h 33m 09s
+27° 06’ 26”

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 June, 17 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: 10h 33m 09s
Dec: +27° 06’ 26”
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 490,410,521 kilometers, equivalent to 3.278192 Astronomical Units. Light takes 27 minutes and 15.8334 seconds to travel from Comet 38P/Stephan-Oterma and arrive to us.

27 minutes and 15.8334 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 0.76572685 Astronomical Units, or 114,551,106 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 18.91.


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: 62.8°
Max altitude: 65.7°
Azimuth: 297.3°
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 09 May 2018 00:00 UTC (JD: 2458248.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.85928268
Orbit inclination i 18.35294424°
Perihelion distance q 1.58849009 AU
237,634,736 km
Aphelion distance Q 20.98854722 AU
3,139,841,979 km
Semi-major axis a 11.28851865 AU
1,688,738,357 km
Orbital period period 37.9300 years
13,853.3198 days
Date of perihelion transit Tp 2018-Nov-10 23:42:56
2,458,433.4882 JD
Next perihelion transit 2056-Oct-15 07:23
2,472,286.8079 JD
Argument of perihelion peri 359.58924026001°
Longitude of the ascending node node 78.000614339312°
Mean anomaly M 355.19279587087°
Mean motion n 0.02598655°/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 Jun 10 10h 22m 42s +28° 33’ 02” 18.69 Leo Minor
2019 Jun 11 10h 24m 02s +28° 22’ 01” 18.72 Leo Minor
2019 Jun 12 10h 25m 20s +28° 11’ 03” 18.75 Leo Minor
2019 Jun 13 10h 26m 40s +28° 00’ 05” 18.78 Leo Minor
2019 Jun 14 10h 28m 00s +27° 49’ 08” 18.80 Leo
2019 Jun 15 10h 29m 18s +27° 38’ 12” 18.83 Leo
2019 Jun 16 10h 30m 38s +27° 27’ 17” 18.86 Leo
2019 Jun 17 10h 31m 57s +27° 16’ 23” 18.88 Leo
2019 Jun 18 10h 33m 15s +27° 05’ 30” 18.91 Leo
2019 Jun 19 10h 34m 35s +26° 54’ 39” 18.94 Leo
2019 Jun 20 10h 35m 53s +26° 43’ 50” 18.96 Leo
2019 Jun 21 10h 37m 13s +26° 33’ 01” 18.99 Leo Minor
2019 Jun 22 10h 38m 30s +26° 22’ 13” 19.02 Leo Minor
2019 Jun 23 10h 39m 50s +26° 11’ 26” 19.04 Leo Minor