© NASA/JPL/MESSENGER

Mercury at perihelion

Dominic Ford, Editor
From the Inner Planets feed

Objects: Mercury
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The sky at

Mercury's 88-day orbit around the Sun will carry it to its closest point to the Sun – its perihelion – at a distance of 0.31 AU from the Sun.

Unlike most of the planets, which follow almost exactly circular orbits around the Sun only varying in their distance from the Sun by a few percent, Mercury has a significantly elliptical orbit.

Its distance from the Sun varies between 0.307 AU at perihelion (closest approach to the Sun), and 0.467 AU at aphelion (furthest recess from the Sun). This variation, of over 50%, means that its surface receives over twice as much energy from the Sun at perihelion as compared to aphelion.

However, this makes little difference to Mercury's telescopic appearance, since little if any detail on its surface can be resolved by ground-based telescopes. Although its changing seasons have an incredible effect upon its surface temperatures, there is little change that is visible to amateur observers.

The position of Mercury at the moment it passes perihelion will be:

Object Right Ascension Declination Constellation Angular Size
Mercury 22h54m30s 5°42'S Aquarius 7.4"
Sun 21h47m 13°17'S Capricornus 32'23"

The coordinates above are given in J2000.0.

From Fairfield, Mercury will become visible at around 17:46 (EDT), 11° above your western horizon, as dusk fades to darkness. It will then sink towards the horizon, setting 1 hour and 31 minutes after the Sun at 18:54.

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The sky on 13 Feb 2033

The sky on 13 February 2033
Sunrise
06:47
Sunset
17:23
Twilight ends
18:56
Twilight begins
05:14

14-day old moon
Waxing Gibbous

99%

14 days old

Planets
Rise Culm. Set
Mercury 07:28 13:11 18:54
Venus 08:03 14:26 20:49
Moon 17:06 23:55 06:37
Mars 01:35 06:24 11:13
Jupiter 06:30 11:33 16:36
Saturn 12:46 20:15 03:44
All times shown in EST.

Warning

Never attempt to point a pair of binoculars or a telescope at an object close to the Sun. Doing so may result in immediate and permanent blindness.

Source

The circumstances of this event were computed using the DE430 planetary ephemeris published by the Jet Propulsion Laboratory (JPL).

This event was automatically generated by searching the ephemeris for planetary alignments which are of interest to amateur astronomers, and the text above was generated based on an estimate of your location.

Related news

13 Feb 2033  –  Mercury at highest altitude in evening sky
19 Mar 2033  –  Mercury at highest altitude in morning sky
26 Mar 2033  –  Mercury at greatest elongation west
03 Jun 2033  –  Mercury at highest altitude in evening sky

Image credit

© NASA/JPL/MESSENGER

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Fairfield

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41.14°N
73.26°W
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