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In the Sky this Week – December 21, 2021

By Robert Trembley  |  21 Dec 2021  |  Sacred Space Astronomy

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This entry is part 218 of 253 in the series In the Sky This Week

Feature|The Sky|The Moon|The Sun|Asteroids|Fireballs|The Solar System|Spacecraft News|Exoplanets|Aurora|Light Pollution|The Universe|

People of Earth: Happy Holiday Season!

A couple days a every month, during the wee hours of morning, the waning gibbous Moon shines through my kitchen skylight. I gawk up at it as I refill my coffee, and give a passing thought to setting up my telescope in the middle of the kitchen floor… but there’s really not enough space.

I’m going to be playing Santa again this year for my granddaughter, and my wife recently got an absolutely beautiful matching Mrs. Claus costume from our master seamstress friend!

  • Connie in her Mrs. Claus costume with her hood up.
  • Santa
    Bob’s vintage Santa outfit – custom made by Jennifer Skwarski. Staff modded by Bob’s wife Connie.
  • Connie in her Mrs. Claus costume with her cape off.
  • Connie in her Mrs. Claus costume with her hood down.

The Sky - In the Sky

Jupiter, Saturn and Venus appear in the southwestern sky after sunset all week. Today is the one-year anniversary of the very close conjunction of Jupiter and Saturn – they’ve separated a little over 17 degrees in the sky since.

Southwestern sky after sunset
Jupiter, Saturn and Venus appear in the southwestern sky after sunset this week. Credit: Bob Trembley / Stellarium.

Mars appear low above the southeastern horizon near the star Antares before sunrise all week.

Southern predawn sky
Mars appear low above the southeastern horizon near the star Antares before sunrise all week. Credit: Bob Trembley / Stellarium.

The Moon appears near the star Pollux above the western horizon before sunrise on Dec. 21st.

Western sky before sunrise
The Moon appears near the star Pollux above the western horizon before sunrise on Dec. 21st. Credit: Bob Trembley / Stellarium.

The Moon appears near the star Regulus above the southwestern horizon before sunrise on Dec. 24th.

Southwestern sky after sunset
The Moon appears near the star Regulus above the southwestern horizon before sunrise on Dec. 24th. Credit: Bob Trembley / Stellarium.

The Moon appears near the star Spica above the southern horizon before sunrise on Dec. 27th.

Southern predawn sky
The Moon appears near the star Spica above the southern horizon before sunrise on Dec. 27th. Credit: Bob Trembley / Stellarium.
The Moon - In the Sky
  • The Moon is a Waning Gibbous – rising after sunset, visible high in the sky after midnight, and visible to the southwest after sunrise.
  • The Third Quarter Moon occurs on Dec. 26th – rising around midnight, and visible to the south after sunrise.
  • After Dec. 26th, the Moon will be a Waning Crescent – visible low to the east before sunrise.
Moon
The Moon from Dec. 21-27, 2021. Visualizations by Ernie Wright / NASA’s Scientific Visualization Studio.

If you click on the Moon image above, or click this link, you will go to NASA’s Moon Phase and Libration, 2021 page – it will show you what the Moon looks like right now. If you click the image on that page, you will download a high-rez TIFF image annotated with the names of prominent features – helpful for logging your lunar observations!

Moon News

Lunar Robot Ice Miner

As we observe the last full moon of 2021, we're thinking ahead to 2022. This time next year, the Moon looks to gain another robotic visitor, an ice-mining experiment delivered by @Int_Machines that will search for ice & other resources below the surface https://t.co/1nj4lhlAS6 pic.twitter.com/nCCnzOhKQe

— NASA Moon (@NASAMoon) December 17, 2021

NASA Lunar Photography Guide

Plan to get out your camera this evening? Here's our lunar photography guide: https://t.co/eWsII1muT9 https://t.co/g8RWv0pz4l

— NASA Moon (@NASAMoon) December 18, 2021

The Sun - In the Sky

WOW! The Sun is covered in spots! 8 names spots, and a lot of discolored plage regions – Spaceweather.com says this is the largest number of visible spots in more than 4 years!

The Sun on December 14, 2021. Credit: SDO/HMI

The Sun seen in 193 angstroms on December 20th

Active regions in the southern hemisphere are blowing flares causing waves to travel through the Sun’s atmosphere. The northern coronal hole appears to be open, but it’s hard to tell through a coronal spray; the southern coronal hole is quite obviously open and fairly large. There is a 4-segment coronal hole along the Sun’s equator.

https://sdo.gsfc.nasa.gov/assets/img/dailymov/2021/12/20/20211220_1024_0193.mp4

The Sun seen in 304 angstroms on December 20th

A huge prominence blows off the Sun in the first moments of this video; The numerous active regions are very obvious – the ones in the southern hemisphere are crackling with flares!

https://sdo.gsfc.nasa.gov/assets/img/dailymov/2021/12/20/20211220_1024_0304.mp4

Videos courtesy of NASA/SDO and the AIA, EVE, and HMI science teams.
You can view the Sun in near real-time, in multiple frequencies here: SDO-The Sun Now.
You can create your own time-lapse movies of the Sun here: AIA/HMI Browse Data.
You can browse all the SDO images of the Sun from 2010 to the present here: Browse SDO archive.


Amateur Solar Astrophotography

Sun
Sun on Dec. 20, 2021. Credit: Mehmet Ergün.

Solar Corona

Solar wind speed is 597.5 km/sec ▲▲ with a density of 0.7 protons/cm3 ▼▼ at 1214 UT.

Sun
SOHO LASCO C2 Latest Image

Click here to see a near real-time animation of the corona and solar wind from the Solar & Heliospheric Observatory (SOHO).

Sun News:

Solar Citizen Science – hunt for solar jets!

Solar science needs YOU! 😎 Check out this 👇 great new citizen science project to hunt for solar jets – bursts of energy from our own #Sun ☀️💥 Based on @NASASun SDO data, the results will also help us understand #SolarOrbiter & Parker Solar Probe data! #WeAreAllSolarOrbiters https://t.co/7joMsrb6w7

— ESA's Solar Orbiter (@ESASolarOrbiter) December 8, 2021

Asteroids - In the Sky
  • Near-Earth Objects (NEOs) discovered this month: 137, this year: 3067 (+55), all time: 27,901 (+54)
  • Potentially Hazardous Asteroids (PHAs): 2238 (+1 updated 2021-12-21)
  • Total Minor Planets discovered (MPC): 1,143,209 (-112, updated 2021-12-21)
  • Total Minor Planets discovered (NASA): 1,113,527 (updated 2021-08-17) – not updated for months.

Upcoming Earth-asteroid encounters:

Asteroid Date(UT) Miss Distance Velocity (km/s) Diameter (m)
2016 YY10 2021-Dec-21 11.3 LD 9.2 23
2017 XQ60 2021-Dec-21 13.7 LD 15.7 47
2021 YB 2021-Dec-23 1.4 LD 5.8 11
2016 TR54 2021-Dec-24 16.9 LD 15.5 135
2018 AH 2021-Dec-27 11.9 LD 12.7 112
2017 AE3 2021-Dec-29 9.3 LD 19.1 155
2014 YE15 2022-Jan-06 19.3 LD 6.4 8
2020 AP1 2022-Jan-07 4.6 LD 5.7 4
2013 YD48 2022-Jan-11 14.6 LD 14.8 107
2021 BA 2022-Jan-18 9.8 LD 9.1 22
7482 2022-Jan-18 5.2 LD 19.6 1732
2018 PN22 2022-Jan-21 11.4 LD 2.7 11
2017 XC62 2022-Jan-24 18.7 LD 4.3 112
2021 BZ 2022-Jan-27 17.6 LD 14.6 39
2018 CA1 2022-Feb-05 9.8 LD 15.1 32
2007 UY1 2022-Feb-08 13.9 LD 6.6 89
2020 DF 2022-Feb-14 12 LD 8.6 20
Notes: LD means “Lunar Distance.” 1 LD = 384,401 km, the distance between Earth and the Moon. 1 LD also equals 0.00256 AU. MAG is the visual magnitude of the asteroid on the date of closest approach.

Asteroid News:

Singer Johnny Cash gets an asteroid named after him

Singer Sting gets an asteroid named after him

How was the #asteroid belt formed?

How was the #asteroid belt formed? Was there a planet there before? Lauren Fuge answers for a child these questions that many of us are used to asking Check out this article from @CosmosMagazine:https://t.co/G0CHgGnFuk pic.twitter.com/aISG8iBMyI

— Asteroid Day ☄ (@AsteroidDay) December 17, 2021
Fireballs - In the Sky

On December 20, 2021, the NASA All Sky Fireball Network reported 11 fireballs!
(7 sporadics, 2 Dec. Leonis Minorids, 1 Quadrantid, 1 Coma Berenicid)

In this diagram of the inner solar system, all of the fireball orbits intersect at a single point–Earth. The orbits are color-coded by velocity, from slow (red) to fast (blue). Credit: SpaceWeather.com

Fireball News:

The Comet and the Fireball
This picture was supposed to feature a comet. Specifically, a series of images of the brightest comet of 2021 were being captured: Comet Leonard. But the universe had other plans. Within a fraction of a second, a meteor so brig… https://t.co/JqPNgAv25V pic.twitter.com/XsoU14IR93

— AstroBlog.CosmoBC (@TheAstroBlog) December 20, 2021

If you see a bright meteor or a fireball, please REPORT IT to the American Meteor Society and the International Meteor Organization!

The Solar System - In the Sky

Position of the planets & several spacecraft in the inner solar system on December 20th:

Inner Solar System
Top-down view of the inner solar system on Dec. 21, 2021. Credit: Bob Trembley / NASA Eyes on the Solar System

Position of the planets in the middle solar system:

Middle Solar System
Top-down view of the middle solar system on Dec. 21, 2021. Credit: Bob Trembley / NASA Eyes on the Solar System

Position of the planets in the outer solar system:

Outer Solar System
Top-down view of the outer solar system on Dec. 21, 2021 – the orbit of dwarf planet Makemake is highlighted.. Credit: Bob Trembley / NASA Eyes on the Solar System

Another view of Makemake’s orbit:

Outer Solar System
Oblique view of the outer solar system on Dec. 21, 2021 – the orbit of dwarf planet Makemake is highlighted. Credit: Bob Trembley / NASA Eyes on the Solar System

Solar System News

At NASA, we have a long tradition of turning fuzzy, distant dots into close-up images of complex worlds by sending robotic spacecraft to explore them (this example is Pluto). Next year, the #MissionToPsyche gets underway to explore a mysterious asteroid: https://t.co/Ql8QuKHGo2 pic.twitter.com/PLvWxnUUvr

— NASA Solar System (@NASASolarSystem) December 20, 2021

Spacecraft News - In the Sky

EZScience episode about the James Webb Space Telescope

What tools will the world's most powerful space telescope use to #UnfoldTheUniverse?

Join @Dr_ThomasZ and Dr. @EllenStofan in this new episode of #EZScience to find out more about @NASAWebb and its scheduled Dec. 24 launch. https://t.co/qJQFLdCIvb pic.twitter.com/6TS9IK3SLb

— NASA (@NASA) December 20, 2021

Flight 18 of the Mars Helicopter

HiRISE - Beautiful Mars

HiPOD: Stratigraphy in Cross Crater

Cross Crater, about 65 kilometers in diameter, is located in the highlands of the Terra Sirenum region of Mars. Minerals like alunite and kaolin-bearing sediments have been detected in this crater. https://t.co/ozq3aQ5ce5
NASA/JPL/UArizona pic.twitter.com/aW5z3buPqp

— HiRISE: Beautiful Mars (NASA) (@HiRISE) December 21, 2021

SpaceX Dragon on its way to the ISS

Stage separation confirmed! The @SpaceX Dragon is now floating freely and flying toward the @Space_Station with science, supplies, and holiday treats aboard for the @NASA_Astronauts. pic.twitter.com/ncOPLLXNgd

— NASA (@NASA) December 21, 2021

Have your postcard sent into SPACE!

Send us your postcards and we will fly them to space on a future #NewShepard mission. https://t.co/YQHovtBg6V

— Blue Origin (@blueorigin) December 20, 2021

“On a Mission” podcast with NASA Persevere Project Manager Jennifer Trosper

🎙️ Just dropped: a new season of @NASAJPL’s “On a Mission” podcast!

In episode one, hear @NASAPersevere Project Manager Jennifer Trosper talk about her personal journey helping put all of our six-wheeled explorers on the Red Planet: https://t.co/GRLYKTVAJD pic.twitter.com/e1FXrSoNKu

— NASA (@NASA) December 20, 2021

DAILI CubeSat to study dayglow in the atmosphere

🚀 The DAILI CubeSat, scheduled to launch tomorrow, will study light emitted by the upper atmosphere during the day, called dayglow. This can help calculate satellites’ orbits.

Learn more: https://t.co/3vvxJKN6td

— NASA Sun & Space (@NASASun) December 20, 2021

CO2

416.45 ppm #CO2

📈 416.45 ppm #CO2 in the atmosphere for the 51st week of 2021 📈 Up from 414.00 ppm a year ago 📈 @NOAA Mauna Loa data: https://t.co/WxFPTcniYz 📈 https://t.co/DpFGQoYEwb updates to check at https://t.co/idlRE62qB1 📈 pic.twitter.com/71JvokVzhu

— CO2_Earth (@CO2_earth) December 20, 2021

See a list of current NASA missions here: https://www.jpl.nasa.gov/missions?mission_status=current

Exoplanets - In the Sky

ex·o·plan·et /ˈeksōˌplanət/, noun: a planet orbiting a star other than the Sun.

All Exoplanets 4884 (+7)
Confirmed Planets Discovered by Kepler 2703
Kepler Project Candidates Yet To Be Confirmed 2060
Confirmed Planets Discovered by K2 477
K2 Candidates Yet To Be Confirmed 1022
Confirmed Planets Discovered by TESS 175 (+2)
TESS Project Candidates Integrated into Archive (2021-12-10 13:00:04)  4708
Current date TESS Project Candidates at ExoFOP 4708
TESS Candidates Yet To Be Confirmed 3113 (-3)

Data from the NASA Exoplanet Archive
* Confirmed Planets Discovered by TESS refers to the number planets that have been published in the refereed astronomical literature.
* TESS Project Candidates refers to the total number of transit-like events that appear to be astrophysical in origin, including false positives as identified by the TESS Project.
* TESS Project Candidates Yet To Be Confirmed refers to the number of TESS Project Candidates that have not yet been dispositioned as a Confirmed Planet or False Positive.

Exoplanet News:

I just LOVE what NASA has been doing with posters in recent years!

In days we'll launch the most powerful and complex space science observatory ever built. @NASAWebb will tell us more about exoplanet atmospheres, giving us a new look at new worlds.🤩 Get the free posters!
English: https://t.co/AdTjl1wUM7
Spanish: https://t.co/CJhWnmiS3l pic.twitter.com/zCHob9tP4B

— NASA Exoplanets (@NASAExoplanets) December 20, 2021

Aurora - In the Sky
Aurora. Taken by Marianne Bergli on December 19, 2021 @ Kvaløya, Tromso, Norway

SpaceWeather.com Realtime Aurora Gallery: https://spaceweathergallery.com/aurora_gallery.html

Latest Aurora Oval Forecast

Aurora – 30 Minute forecast. Credit: NOAA. Click image to see northern and southern hemisphere Aurora forecast.
Light Pollution - In the Sky

80% of World’s population lives under light polluted skies [Study].

We have a long way to go to protect the night for future generations. Please give today to help us grow our network of advocates, protect our night skies, & educate communities who want to make a difference for future generations. https://t.co/qk1Ajg5Gp0

📷 Linda Ulasiewicz pic.twitter.com/ff3wUskGxB

— DarkSky International (@IDADarkSky) December 17, 2021

  • Visit an International Dark Sky Park: https://www.darksky.org/our-work/conservation/idsp/parks/
  • If you live in Michigan, visit the Michigan Dark Skies site: https://sites.lsa.umich.edu/darkskies/
The Universe - In the Sky

Work at NASA!

Had the opportunity of being a NASA flight controller or mission control engineer presented itself when I was a young man, my life would likely have taken a different course!

Do you have what it takes to lead an elite team of flight controllers?

NASA is looking for flight directors to lead human spaceflight missions from mission control at @NASA_Johnson. Applications are due Thursday, Dec. 16. Learn more: https://t.co/uzAdgYM2z1

— Kathy Lueders (@KathyLueders) December 10, 2021

Beautiful Universe: Comet C/2021 A1 (Leonard)

This time-exposure of the comet was taken by Doug Bock, an astrophotographer buddy and member of the Warren Astronomical Society.

Comet C-2021 A1 (Leonard) – November 22-23, 2021. Credit: Doug Bock

C/2021 A1 (Leonard) is an inbound long period comet discovered by G. J. Leonard at the Mount Lemmon Observatory on 3 January 2021 (a year before perihelion) when the comet was 5 AU (750 million km) from the Sun. This was the first comet discovered in 2021 and it has a retrograde orbit.

On 12 December 2021 the comet was 0.233 AU (34.9 million km) from Earth and on 18 December 2021 it was 0.028 AU (4.2 million km) from Venus. It will make its closest approach to the Sun on 3 January 2022. On 10 October the comet showed a short but dense dust tail. In early December the comet had an apparent magnitude (coma+nucleus) of around 6. The first reports of naked eye observations by experienced observers started coming in on 5 December 2021. Much like observing Messier 33, the low surface brightness of the comet can make it difficult to observe near urban areas.

As of 20 December 2021, the comet is in an outburst around apparent magnitude 3, making it a naked eye comet for the Southern hemisphere. – Wikipedia

Software Apps used for this post:

NASA Eyes on the Solar System: an immersive 3D solar system and space mission simulator – free for the PC /MAC.
Stellarium: a free web-based planetarium app. It’s a great tool for planning observing sessions.

Feature|The Sky|The Moon|The Sun|Asteroids|Fireballs|The Solar System|Spacecraft News|Exoplanets|Aurora|Light Pollution|The Universe|

Clear skies, stay safe, be well, and look up!

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