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In the Sky this Week – April 6, 2021

By Robert Trembley  |  6 Apr 2021  |  Sacred Space Astronomy

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This entry is part 191 of 253 in the series In the Sky This Week

There’s a helicopter on Mars!

The Ingenuity rovercraft has unfolded from the bottom of the Perseverance rover, and been dropped onto the surface of Mars. The craft survived its first frigid night on Mars; there is to be more testing of the power system and rotor blades before its first flight – scheduled for no sooner than April 11th.

NASA is definitely not taking Ironman’s “fly first, analyze later” approach to testing complicated mechanical systems – which, as an engineer, makes perfect sense… as a impatient space geek, it’s completely maddening!

Safe & sound on the surface of Mars: the #MarsHelicopter, Ingenuity, has survived the first cold night on its own, a major milestone for the small rotorcraft because surface temps can plunge as low as -130 degrees F (-90 degrees C). https://t.co/IqrL757Peg pic.twitter.com/MkSe1UNLKG

— NASA JPL (@NASAJPL) April 5, 2021

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

Mars appears near the constellations Orion and Taurus high in the western sky after sunset all week.

Western sky after sunset
Credit: Bob Trembley / Stellarium.

Jupiter and Saturn appear low above the southeastern horizon before dawn all week; the Moon appears near Saturn on April 6th, and Jupiter on April 7th. The Moon appears in line with Jupiter and Saturn on April 8th.

  • Southeastern predawn horizon
    Credit: Bob Trembley / Stellarium.
  • Southeastern predawn horizon
    Credit: Bob Trembley / Stellarium.
  • Southeastern predawn horizon
    Credit: Bob Trembley / Stellarium.

The Moon is a waning crescent – visible low to the east before sunrise.

The new Moon occurs on April 12th – it will not be visible between April 10-13th.

Moon
The Moon from 2021-03-30 – 2021-04-05. 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:

Imagine you’re standing at one of the Moon’s poles. Instead of sunrise and sunset, the Sun appears to travel a full 360 degrees around the horizon. The resulting pattern of daylight and shadows is unlike anywhere else on the Moon, or the Earth. https://t.co/UjH0UN92NQ pic.twitter.com/AQY3i3t1Wk

— NASA Moon (@NASAMoon) April 1, 2021

Sunspot AR2813 is decaying, and poses no threat for strong flares. Credit: SDO/HMI

The Sun has 1 named sunspot – it’s small, and will soon be rotating out of view

SpaceWeather.com reports:

GEOMAGNETIC FORECAST: Today Earth’s polar magnetic field could be disturbed by the arrival of a minor solar wind stream. ETA: April 6th or 7th. The gaseous material is flowing from a southern hole in the sun’s atmosphere. Sky watchers around the Arctic Circle should be alert for auroras mixed with waxing Spring twilight.

Light coronal loop activity; several small coronal holes pepper the Sun’s facenear the equator seem to want to merge, but never actually do – that whole region just looks like it’s boiling! The hole at the Sun’s south pole is smaller than last week, and is about the same size as the northern hole.

https://sdo.gsfc.nasa.gov/assets/img/dailymov/2021/04/05/20210405_1024_0193.mp4
The Sun seen in 193 angstroms on April 5, 2021

Continuous prominence activity for the last couple days – the one in the upper right is very active!

https://sdo.gsfc.nasa.gov/assets/img/dailymov/2021/04/05/20210405_1024_0304.mp4
The Sun seen in 304 angstroms on April 5, 2021
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.

 

Solar Activity on Facebook – Run by Volunteer NASA/JPL Solar System Ambassador Pamela Shivak

Sun
SOLARACTIVITY PICTURE OF THE DAY for Tuesday April 6th, 2021 goes out to Randy Shivak for this great prominence shot. Randy commented: “Fighting with the incoming clouds I captured this one prominence on the SW solar limb. Captured with the 228mm F9 refractor along with a Baader TZ-4, and D-ERF, Daystar Quantum PE .5 angstrom filter and ZWO asi174mm video camera.”

Solar Corona

Solar wind speed is 321.1 km/sec, with a density of 11.4 protons/cm3 at 1030 UT.

Near real-time animation of the corona and solar wind from the Solar & Heliospheric Observatory (SOHO):

SOHO LASCO C2 Latest Image
Animated LASCO C2 Coronograph showing the solar corona above the Sun’s limb (the white circle). Credit: NASA/JPL-Caltech-SOHO

Sun News

This #SunDay, meet the tiny solar projectiles that can travel from the Sun to Earth — a 93 million mile journey — in under an hour. Solar energetic particles are one of the main challenges for the future of human spaceflight, and they’re hard to predict. https://t.co/yuGlKGRjP6 pic.twitter.com/gjdIFfKdBK

— NASA Sun & Space (@NASASun) April 4, 2021

As the director of the Heliophysics Division, Dr. Nicky Fox leads NASA’s efforts to explore the star that makes life possible on Earth: our Sun. Get to know Nicky: https://t.co/W7jR3hAesj pic.twitter.com/PhvH0zOtOg

— NASA Sun & Space (@NASASun) April 5, 2021

  • Near-Earth Objects (NEOs) discovered this month: : 49, this year: 757, all time: 25,567 (+52)
  • Potentially hazardous asteroids: 2173 (+1, updated 2021-03-30)
  • Total Minor Planets discovered (NASA): 1,071,546 (+2795)
  • Total Minor Planets discovered (MPC): 1,043,047 (updated 2021-03-16)

Upcoming Earth-asteroid encounters:

Asteroid Date(UT) Miss Distance Velocity (km/s) Diameter (m)
2021 GP 2021-Apr-06 4.4 LD 4.5 7
2015 MB54 2021-Apr-06 13.6 LD 3.7 57
2021 GL1 2021-Apr-06 5.1 LD 12.4 25
2021 GB 2021-Apr-06 7.9 LD 4 14
2020 GE1 2021-Apr-07 12.2 LD 4.2 14
2021 GG1 2021-Apr-07 5.3 LD 14.4 18
2014 FO38 2021-Apr-07 16.8 LD 8.3 20
2021 EH4 2021-Apr-08 13.1 LD 7.7 36
2021 GT 2021-Apr-09 2.9 LD 12.2 19
2021 GT1 2021-Apr-10 12 LD 5.5 24
2021 GZ 2021-Apr-12 12.9 LD 13.1 36
2021 GQ 2021-Apr-12 8 LD 5.9 23
2020 UY1 2021-Apr-15 16 LD 8.7 22
2017 HG4 2021-Apr-16 7.6 LD 4.1 10
2020 HE5 2021-Apr-17 8.5 LD 4.3 10
2019 HQ 2021-Apr-20 14.8 LD 8.8 20
2020 HO5 2021-Apr-22 16.5 LD 3.3 7
2019 PS1 2021-Apr-23 14.5 LD 10 16
2016 QE45 2021-Apr-24 13.2 LD 15.3 162
2021 FK3 2021-Apr-24 15.7 LD 14 121
2015 HA177 2021-Apr-26 18.7 LD 8.7 10
2019 HF4 2021-Apr-26 7.8 LD 6.8 11
2021 EZ4 2021-Apr-29 14.9 LD 2.5 20
2019 VT3 2021-May-01 12.1 LD 5.9 8
2021 AF8 2021-May-04 8.8 LD 9.4 344
2018 JP 2021-May-05 10.6 LD 7.8 12
2021 AE4 2021-May-06 18.5 LD 9.1 153
2021 GK1 2021-May-12 1.5 LD 2 13
2015 KJ19 2021-May-14 15.1 LD 23 118
478784 2021-May-18 15.8 LD 5 27
2013 VO11 2021-May-25 3.8 LD 10.1 8
2018 LB 2021-Jun-01 2.9 LD 7.7 22
Notes: LD means “Lunar Distance.” 1 LD = 384,401 km, the distance between Earth and the Moon. Table from SpaceWeather.com

Asteroid News:

Near-Earth objects (#NEOs) pass by Earth all the time, and it’s important to find them early to confirm they aren't a threat. How many known NEOs are there? Did any #asteroids pass by last month to know about? Learn this and more in this month’s #PlanetaryDefense by the Numbers! pic.twitter.com/cXKGItyd2k

— NASA Asteroid Watch (@AsteroidWatch) April 1, 2021

On April 5, 2021, the NASA All Sky Fireball Network reported 9 fireballs!
(9 sporadics)

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

Daylight Fireball Update – we think it dropped a #meteorite in the New Forest, or a bit further North, based on Jersey dashcam and #sonicboom sources.
Interim result, press release and images on the UKFALL website. @BritAstro @willgater @simon_sat @OptaSense @UKMeteorNetwork pic.twitter.com/tZtVshnJUL

— UK Fireball Alliance (@UK_Fireball) March 30, 2021

Our #MNRAS paper just got published #openaccess at https://t.co/xAZ2hizEnS Learn the stages and phenomena related to a space object colliding with our planet and see what constitutes most its atmospheric flight — and most importantly — what is the outcome! pic.twitter.com/ufMWvb1mlf

— Maria Gritsevich (@GritsevichMaria) April 1, 2021

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

Position of the planets and several spacecraft in the inner solar system:

Inner Solar System
Credit: NASA Eyes on the Solar System

Position of the planets in the middle solar system:

Middle Solar System
Credit: NASA Eyes on the Solar System

Position of the planets, and a several transneptunian objects in the outer solar system.

Outer Solar System
Credit: NASA Eyes on the Solar System

International Space Station:

🎉 Happy 10th anniversary, @Commercial_Crew!

Through this program, public-private partnerships have returned human spaceflight to the United States. #LaunchAmerica missions to the @Space_Station enable even more @ISS_Research on our orbiting lab: https://t.co/t9WxG6uYEB pic.twitter.com/6rRhG9vwrE

— NASA (@NASA) April 5, 2021

HiRISE – on the Mars Reconnaissance Orbiter:

HiPOD 4 Apr 21: Frosty Gullies on the Northern Plains

On Mars most frost is carbon dioxide (dry ice) rather than water ice. This frost appears to cause surface activity, including flows in gullies.

NASA/JPL/UArizonahttps://t.co/k9Nq52SsUw#Mars #science #NASA pic.twitter.com/xLoof3IdnS

— HiRISE: Beautiful Mars (NASA) (@HiRISE) April 4, 2021

Hi3D: Flow Features near a Crater

Flow textures visible at the edge of crater ejecta. HiRISE can help to examine the nature and origins of these features. They are found associated with some of the most well-preserved craters within notable topography.https://t.co/3A29Z8GKEE pic.twitter.com/VkSMpzyuB4

— HiRISE: Beautiful Mars (NASA) (@HiRISE) April 5, 2021

Hubble Space Telescope:

With over 30 years of operation, @NASAHubble has made over 1.4M observations & transformed our view & understanding of the universe. Astronomers have published over 18k scientific papers using Hubble data. Find some in the STI Repository: https://t.co/aNJRryTMJw #MissionMonday pic.twitter.com/BDES9DnJ1Q

— NASA STI Program (@NASA_STI) April 5, 2021

Hubble is now on #Instagram! Follow us to marvel at the beautiful images of the Universe taken by the NASA/ESA Hubble Space Telescope over time. https://t.co/2SC2491Ob5
Credit: @ESA / Hubble_Space pic.twitter.com/1tSdPr51Fv

— HUBBLE (@HUBBLE_space) September 25, 2018

We're seeing double!

Hubble spotted a pair of quasars about 10 billion light-years away. They’re so close that they look like one object to ground-based telescopes, but above Earth’s murky atmosphere, Hubble can distinguish the pair. Learn more: https://t.co/2LNgl9IgeS pic.twitter.com/JjXesdlpdC

— Hubble (@NASAHubble) April 6, 2021

Chandra X-Ray Observatory:

🛰️Astronomers have detected X-rays from #Uranus for the first time! The seventh planet from the Sun is located about 1.8 billion miles (2.9 billion kilometers) from Earth. What could cause Uranus to emit X-rays? Explore the science at: https://t.co/WcCB8bceVT pic.twitter.com/N7goCV7ael

— Chandra Observatory (@chandraxray) March 31, 2021

Climate:

This new @NASAEarth science mission – GeoCarb – could give us new insights into the global carbon cycle by mapping key gases from an orbit that would allow it to constantly remain over the Americas. Details: https://t.co/AvwvPZtpxT pic.twitter.com/Od6AOaxez7

— NASA (@NASA) January 13, 2018

Meltwater draining to the base of Greenland glaciers acts like water on a slide, accelerating ice sheet melt into the ocean. Researchers camped on Russell Glacier to learn more about how water below glaciers affects Greenland’s additions to rising seas.https://t.co/vtI2UjwIt1 pic.twitter.com/ARZzlrxn52

— NASA Earth (@NASAEarth) April 5, 2021

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

Exoplanet

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

All Exoplanets 4375 (+8)
Confirmed Planets Discovered by Kepler 2394
Kepler Project Candidates Yet To Be Confirmed 2366
Confirmed Planets Discovered by K2 426
K2 Candidates Yet To Be Confirmed 889
Confirmed Planets Discovered by TESS 122 (+2)
TESS Project Candidates Integrated into Archive (2021-03-27 13:00:02) 2601  (+4)
Current date TESS Project Candidates at ExoFOP 2601
TESS Candidates Yet To Be Confirmed 1425 (-16)

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

We know of thousands of exoplanets – planets beyond our solar system. We're surveying and studying these weird, wondrous worlds in our search for life and to better understand how planets form and develop.https://t.co/iGtZLFq8sI pic.twitter.com/rwjAPIRD2h

— NASA Exoplanets (@NASAExoplanets) April 5, 2021

https://twitter.com/AstroBalrog/status/1379417992333819906
Aurora – Taken by Brian Emfinger on April 6, 2021 @ Greenland

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

International Dark Sky Week (April 5-12)

International Dark Sky Week (April 5-12) is just around the corner! Explore the new website, learn more about the global dark sky movement, and find an event to attend here: https://t.co/oejeBOz4Xf pic.twitter.com/NXHhQo3M7U

— DarkSky International (@IDADarkSky) April 2, 2021

Visit an International Dark Sky Park: https://www.darksky.org/our-work/conservation/idsp/parks/

For Teachers:

So far, we've found 4,144 exoplanets, planets beyond our solar system. Of those, 1,300+ are gas giants. So, this coloring book from @NASAJuno is 😍

How do you picture the swirling storms on our solar system's biggest planet? #ColorWithNASA and show us! https://t.co/InpaVNm9i9

— NASA Exoplanets (@NASAExoplanets) April 9, 2020

Hubble – Beautiful Universe: NGC 3628

NGC 3628. Credit:  Data: Paul Gardner, Great Basin Observatory; Processing: Rogelio Bernal Andreo (DeepSkyColors.com)

What do spiral galaxies look like sideways? Featured is a sharp telescopic view of a magnificent edge-on spiral galaxy NGC 3628, a puffy galactic disk divided by dark dust lanes. Of course, this deep galactic portrait puts some astronomers in mind of its popular moniker, The Hamburger Galaxy.

The tantalizing island universe is about 100,000 light-years across and 35 million light-years away in the northern springtime constellation Leo. NGC 3628 shares its neighborhood in the local Universe with two other large spirals M65 and M66 in a grouping otherwise known as the Leo Triplet. Gravitational interactions with its cosmic neighbors are likely responsible for the extended flare and warp of this spiral’s disk.

– NASA/ESA


Stay safe, be well, and look up!


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. I maintain the unofficial NASA Eyes Facebook page.
SpaceEngine: a free 3D Universe Simulator for Windows. Steam version with VR support available.
Stellarium: a free open source planetarium app for PC/MAC/Linux. It’s a great tool for planning observing sessions. A web-based version of Stellarium is also available.

Stellarium v0.21.0 was released on March 28th – there are numerous updates and features; the developers mentioned that they have published a scientific paper about the application of Stellarium in cultural astronomy: https://doi.org/10.1558/jsa.17822


Section header image credits:
The Sky – Stellarium / Bob Trembley
Observing Target – Turn Left at Orion / M. Skirvin
The Moon – NASA/JPL-Caltech
The Sun – NASA/JPL-Caltech
Asteroids – NASA/JPL-Caltech
Fireballs – Credited to YouTube
Comets – Comet P/Halley, March 8, 1986, W. Liller
The Solar System – NASA Eyes on the Solar System / Bob Trembley
Spacecraft News – NASA Eyes on the Solar System / Bob Trembley
Exoplanets – Space Engine / Bob Trembley
Light Pollution – NASA’s Black Marble
Aurora – Bob Trembley
The Universe – Universe Today

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