Wikipedia

January 2018 lunar eclipse

A total lunar eclipse occurred on 31 January 2018. The Moon was near its perigee on 30 January and as such may be described as a "supermoon", when the Moon's distance from the Earth is less than 360,000 km (223,694 miles). The previous supermoon lunar eclipse was in September 2015.[1]

January 2018 lunar eclipse
Total eclipse
Totality as viewed from Lomita, California
Date31 January 2018
Gamma−0.3014
Magnitude1.3155
Saros cycle124 (49 of 74)
Totality76 minutes, 4 seconds
Partiality202 minutes, 44 seconds
Penumbral317 minutes, 12 seconds
Contacts (UTC)
P110:51:15
U111:48:27
U212:51:47
Greatest13:29:50
U314:07:51
U415:11:11
P416:08:27

During the total lunar eclipse of Wednesday, 31 January 2018, the Moon was 360,202 km (only 202 km to be a Super Full Moon) (223,819 mi) from the Earth. A blue moon occurs because there are 2 full moons in the same calendar month, or if there are 4 full moons in the same season (third of four is blue moon). As this supermoon was also a blue moon (the second full moon in a calendar month), it was referred to as a "super blue blood moon"; "blood" refers to the typical red color of the Moon during a total lunar eclipse. The 31 January 2018 lunar event was called 'Trifecta'.[2] This coincidence last occurred on 30 December 1982 for the eastern hemisphere,[3] and otherwise before that on 31 March 1866.[4][5] The next occurrence will be on 31 January 2037, one metonic cycle (19 years) later.

Background

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Main article: Lunar eclipse

A lunar eclipse occurs when the Moon passes within Earth's umbra (shadow). As the eclipse begins, Earth's shadow first darkens the Moon slightly. Then, the shadow begins to "cover" part of the Moon, turning it a dark red-brown color (typically – the color can vary based on atmospheric conditions). The Moon appears to be reddish because of Rayleigh scattering (the same effect that causes sunsets to appear reddish) and the refraction of that light by Earth's atmosphere into its umbra.[6]

The following simulation shows the approximate appearance of the Moon passing through Earth's shadow. The northern portion of the Moon is closest to the center of the shadow, making it darkest and reddest in appearance.

 

"Super blue blood moon"

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This was a "supermoon", as the Moon was near to its closest distance to earth in its elliptical orbit, making it 7% larger in apparent diameter or 14% larger in area, than an average full moon. The previous supermoon lunar eclipse was the September 2015 lunar eclipse.[1]

The full moon of 31 January 2018 was the second full moon that calendar month (in most time zones), making it, under one definition of the term, a "blue moon".

Additionally referencing the orange or red "blood" colors that occur during a lunar eclipse, media sources described the event as a "super blue blood Moon".[7]

Characteristics

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Visibility

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The Pacific Ocean was turned toward the Moon at the time of the eclipse. Central and eastern Asia (including most of Siberia), Philippines, Indonesia, New Zealand and most of Australia got a good view of this moon show in the evening sky. For Western Asia, the Indian subcontinent, the Middle East and Eastern Europe, the eclipse was underway as the moon rose.[8]

Along the U.S. West Coast, the total phase began at 4:51 a.m. PST. The further east, the closer the start of the partial phases coincided with moonset. Along the U.S. Atlantic Seaboard, for instance, the Moon had only just begun to enter the darkest part of Earth's shadow, the umbra, at 6:48 a.m. EST when it disappeared from view below the west-northwest horizon. The duration of the total phase was 77 minutes, with the Moon tracking through the southern part of the Earth's shadow. During totality, the Moon's lower limb appeared brighter than the dark upper limb.[8]

   
 
Visibility map

Timing

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Event timing by time zone
Eclipse HST AKST PST MST CST EST UTC MSK IST ICT CST JST AEDT NZDT
Zone from UTC −10 h −9 h −8 h −7 h −6 h −5 h 0 h +3 h +5½ h +7 h +8 h +9 h +11 h +13 h
Penumbral eclipse begins 00:51 01:51 02:51 03:51 04:51 05:51 10:51 13:51 — 17:51 18:51 19:51 21:51 23:51
Partial eclipse begins 01:48 02:48 03:48 04:48 05:48 06:48 11:48 14:48 17:18 18:48 19:48 20:48 22:48 00:48
Total eclipse begins 02:52 03:52 04:52 05:52 06:52 — 12:52 15:52 18:22 19:52 20:52 21:52 23:52 01:52
Mid-eclipse 03:30 04:30 05:30 06:30 — — 13:30 16:30 19:00 20:30 21:30 22:30 00:30 02:30
Total eclipse ends 04:08 05:08 06:08 07:08 — — 14:08 17:08 19:38 21:08 22:08 23:08 01:08 03:08
Partial eclipse ends 05:11 06:11 07:11 — — — 15:11 18:11 20:41 22:11 23:11 00:11 02:11 04:11
Penumbral eclipse ends 06:08 07:08 — — — — 16:08 19:08 21:38 23:08 00:08 01:08 03:08 05:08
  •  
    Example in Aichi Prefecture, Japan:
    1. Penumbral lunar eclipse 20:23 (JST)
    2. Partial lunar eclipse 21:13 (JST)
    3. Partial lunar eclipse 21:43 (JST)
    4. Total lunar eclipse (blood moon) 21:55 (JST)
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North America

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Asia and Middle East

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Oceania

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Eclipses of 2018

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The January 2018 lunar eclipse is the first ascending node eclipse of the lunar eclipse series sets from 2016 to 2020. It is also part of Saros cycle 124.

Lunar eclipse series sets from 2016–2020
Descending node   Ascending node
Saros Date Type
Viewing 		Gamma Saros Date
Viewing 		Type
Chart 		Gamma
109 2016 Aug 18
  		Penumbral
  		1.56406 114
  		2017 Feb 11
  		Penumbral
  		−1.02548
119
  		2017 Aug 07
  		Partial
  		0.86690 124
  		2018 Jan 31
  		Total
  		−0.30143
129
  		2018 Jul 27
  		Total
  		0.11681 134
  		2019 Jan 21
  		Total
  		0.36842
139
  		2019 Jul 16
  		Partial
  		−0.64300 144
  		2020 Jan 10
  		Penumbral
  		1.07270
149 2020 Jul 05
  		Penumbral
  		−1.36387
Last set 2016 Sep 16 Last set 2016 Mar 23
Next set 2020 Jun 05 Next set 2020 Nov 30

A similar eclipse occurs on 31 January 2037, one metonic cycle of 19 years in the future.

Half-Saros cycle

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A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).[9] This lunar eclipse is related to two annular solar eclipses of Solar Saros 131.

26 January 2009 6 February 2027
   

See also

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References

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  1. ^ a b Super Blue Moon eclipse on January 31, Earthsky.org, January 30 2018
  2. ^ "'Super Blue Blood Moon' Coming Jan. 31, 2018". NASA. 18 January 2018. Retrieved 1 February 2018.
  3. ^ Blue moon, based on the previous full moon, was either on November 30 or December 1, 1982, based on time zones.
  4. ^ Rare 'Super Blue Blood Moon' Coming—First in 35 Years, National Geographic, January 29, 2018
  5. ^ Mathewson, Samantha (30 January 2018). "The Super Blue Blood Moon Wednesday Is Something the US Hasn't Seen Since 1866". Space.com. Retrieved 1 February 2018.
  6. ^ Fred Espenak & Jean Meeus. "Visual Appearance of Lunar Eclipses". NASA. Retrieved 13 April 2014.
  7. ^ Gill, Victoria (31 January 2018). "Skywatchers see 'super blue blood Moon'". BBC News. Retrieved 1 February 2018.
  8. ^ a b Rao, Joe. "First Blue Moon Total Lunar Eclipse in 150 Years Coming This Month". Space.com. Retrieved 2 January 2018.
  9. ^ Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros
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Wikimedia Commons has media related to Lunar eclipse of 2018 January 31.


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