© NASA/Ricardo Nunes

Venus at greatest brightness

Dominic Ford, Editor
From the Inner Planets feed

Objects: Venus
Please wait
Loading 0/4
Click and drag to rotate
Mouse wheel to zoom in/out
Touch with mouse to dismiss
The sky at

Venus will reach its greatest brightness in its 2017 morning apparition. It will be shining brightly at mag -4.5.

From Fairfield , this apparition will not be one of the most prominent but prominent, reaching a peak altitude of 31° above the horizon at sunrise on 28 Jul 2017.

Begin typing the name of a town near to you, and then select the town from the list of options which appear below.

2017 morning apparition of Venus

25 Mar 2017 – Venus at inferior solar conjunction
26 Apr 2017 – Venus at greatest brightness
03 Jun 2017 – Venus at greatest elongation west
04 Jun 2017 – Venus at dichotomy
07 Aug 2017 – Venus at highest altitude in morning sky

The table below lists the altitude of Venus at sunrise over the course of the apparition. All times are given in Fairfield local time.

Date Sun
rises at
Venus
rises at
Altitude
at sunrise
Direction
at sunrise
Mag Phase
09 May 201705:4203:5319°east-4.533%
19 May 201705:2903:3720°east-4.440%
29 May 201705:2203:2421°east-4.347%
08 Jun 201705:2003:1023°east-4.352%
18 Jun 201705:1902:5825°east-4.257%
28 Jun 201705:2202:5028°east-4.162%
08 Jul 201705:2802:4529°east-4.166%
18 Jul 201705:3302:4130°east-4.169%
28 Jul 201705:4502:4531°east-4.073%
07 Aug 201705:5402:5531°east-4.076%
17 Aug 201706:0603:1031°east-4.080%
27 Aug 201706:1503:2630°east-4.082%
06 Sep 201706:2403:4728°east-4.085%
16 Sep 201706:3604:0926°east-3.987%
26 Sep 201706:4304:3024°east-3.990%
06 Oct 201706:5604:5522°east-3.992%
16 Oct 201707:0605:1919°east-3.993%
26 Oct 201707:1705:4017°east-3.995%

Altitude of Venus at sunrise

A graph of the brightness of Venus is available here.

Apparitions of Venus

06 Jun 2015 – Evening apparition
26 Oct 2015 – Morning apparition
12 Jan 2017 – Evening apparition
03 Jun 2017 – Morning apparition
17 Aug 2018 – Evening apparition
06 Jan 2019 – Morning apparition
24 Mar 2020 – Evening apparition

Observing Venus

Venus's orbit lies closer to the Sun than the Earth's, meaning that it always appears close to the Sun and is lost in the Sun's glare much of the time.

It is observable for a few months each time it reaches greatest separation from the Sun – moments referred to as greatest elongation. These apparitions repeat roughly once every 1.6 years.

On these occasions, Venus is so bright and conspicuous that it becomes the third brightest object in the sky after the Sun and Moon. It is often called the morning star or the evening star.

Venus's brightness

Venus's brightness depends on two factors: its closeness to the Earth, and its phase. Its phase varies depending on its position relative to the Earth. When it passes between the Earth and Sun, for example, the side that is turned towards the Earth is entirely unilluminated, like a new moon.

Conversely, when it lies opposite to the Earth in its orbit, passing almost behind the Sun, it appears fully illuminated, like a full moon. However, at this time it is also at its most distant from the Earth, so it is actually fainter than at other times.

Venus reaches its brightest when it is still a crescent – with less than half of its disk illuminated. This is because it is much closer to the Earth during its crescent phases than at other times.

As a result, during evening apparitions, Venus reaches maximum brightness a few days after it is at greatest separation from the Sun, which always coincides with it showing half-phase (dichotomy).

Conversely, during morning apparitions, Venus reaches maximum brightness a few days before it is at greatest separation from the Sun.

Venus's position

The coordinates of Venus when it reaches its greatest brightness will be:

Object Right Ascension Declination Constellation Angular Size
Venus 23h53m00s 1°28'N Pisces 40.5"
Sun 02h16m +13°40' Aries 31'46"

The coordinates above are given in J2000.0.

The sky on 26 April 2017
Sunrise
05:58
Sunset
19:46
Twilight ends
21:30
Twilight begins
04:14

29-day old moon
Waxing Crescent

0%

29 days old

Planets
Rise Culm. Set
Mercury 05:32 12:10 18:49
Venus 04:19 10:28 16:36
Moon 06:21 13:07 20:04
Mars 07:16 14:39 22:03
Jupiter 17:48 23:34 05:21
Saturn 23:45 04:26 09:06
All times shown in EDT.

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

02 Feb 2017  –  Venus at highest altitude in evening sky
03 Jun 2017  –  Venus at greatest elongation west
07 Aug 2017  –  Venus at highest altitude in morning sky
13 Jun 2018  –  Venus at highest altitude in evening sky

Image credit

© NASA/Ricardo Nunes

Share

Follow

Fairfield

Latitude:
Longitude:
Timezone:

41.14°N
73.26°W
EDT

Color scheme