Susanne M Hoffmann
susanne-m-hoffmann.bsky.social
Susanne M Hoffmann
@susanne-m-hoffmann.bsky.social
astronomer
Reposted by Susanne M Hoffmann
🟡 Quadrans – 44 Boo A
Yellow sun-like star in #Boötes, mag 4.83.
🌡️ 5877 K | 1.04 M☉ | 1.55 R☉ | 41 ly
Name Quadrans (“quadrant”) from the obsolete constellation Quadrans Muralis, near the radiant of the Quadrantids.
Hosts a 23 K debris disk; part of a triple system.
#Quadrans #IAUStarNames #44Boötis
November 29, 2025 at 5:14 PM
Reposted by Susanne M Hoffmann
⭐️ Cassiopeia, Star Names
WGSN has standardized the traditional names in Cassiopeia:
Segin (uncertain origin),
Tiansi (ancient Chinese),
Ruchbah (“the knee,” Arabic),
Caph (“the hand,” Indigenous Arab),
Schedar (“the breast,” Arabic–Greek).
A constellation rich in global heritage.
December 9, 2025 at 4:32 PM
Reposted by Susanne M Hoffmann
🔺 Triangulum — Star Names
Alaybasān (β Tri) — Arab.
Deltoton — Greek.
Apdu (γ Tri) — Egyptian.
Mothallah (α Tri) — Arabic.
Triangulum unites Arab, Greek, and Egyptian sky traditions.
#Triangulum #StarNames
December 10, 2025 at 4:44 PM
Reposted by Susanne M Hoffmann
🎄🦌 Aldu — ε Persei
A bluish-white B-type star (mag 2.9) in Perseus. Named Áldu (“Reindeer Cow”) from Sami tradition, part of the winter reindeer constellation. Rapidly pulsating spectroscopic binary, 26,500 K, 15 M☉, 6 R☉, 537 ly.
IAU Dec 2025.
#Aldu #IAUStarNames
January 1, 2026 at 9:23 PM
Reposted by Susanne M Hoffmann
🎄🟠 Kamelos — HD 45866
A faint K-type red giant in Camelopardalis. Kamelos (“camel”) plays on the Greek roots of the Giraffe constellation and its 17th-century lore. Cool, swollen, and quiet: 4200 K, ~52 R☉, 579 ly.
IAU Dec 2025.
#Kamelos #IAUStarNames
January 2, 2026 at 7:55 AM
Reposted by Susanne M Hoffmann
🔴 In 2025, the IAU WGSN approved 40 new official star names from global sky traditions, including Chinese, Arabic, Sámi, Indian, Egyptian, and classical Greek & Latin sources—celebrating humanity’s shared astronomical heritage.
#IAU #WGSN #StarNames #Astronomy
January 3, 2026 at 4:54 AM
Reposted by Susanne M Hoffmann
🔴 In 2025, the IAU WGSN approved 40 new official star names from global sky traditions, including Chinese, Arabic, Sámi, Indian, Egyptian, and classical Greek & Latin sources—celebrating humanity’s shared astronomical heritage.
#IAU #WGSN #StarNames #Astronomy
January 3, 2026 at 4:55 AM
Reposted by Susanne M Hoffmann
⚪ Huagai — ι Cassiopeiae
A complex multiple-star system in Cassiopeia. Huagai (“Imperial Canopy”) crowns the Purple Forbidden Palace in ancient Chinese astronomy. Magnetic, hierarchical system, ~141 ly, circumpolar.
IAU Dec 2025.
#Huagai #IAUStarNames
January 2, 2026 at 9:37 PM
Reposted by Susanne M Hoffmann
🎄 Tarandus — 2 UMi
Warm orange giant near the North Celestial Pole (mag 4.22).
Name from Rangifer (Reindeer), Latinized from Greek tárandos.
🌡️ ~4510 K | ~2.3 M☉ | ~24 R☉ | ~312 ly
IAU adopted Dec 2025.
#Tarandus #IAUStarNames
December 30, 2025 at 1:51 PM
Reposted by Susanne M Hoffmann
🎄 Rangifer — 49 Cas
A circumpolar G-type giant (mag ~5) in Cassiopeia.
Named after the extinct constellation Rangifer (Reindeer), inspired by Sámi sky traditions and introduced in 1743.
🌡️ ~4880 K | ~1.1 M☉ | ~19 R☉ | ~426 ly
IAU adopted Dec 2025.
#Rangifer #IAUStarNames 🦌✨
December 31, 2025 at 4:11 AM
here are some constellations from Napoli

youtu.be/dVihQsS_BQM?...
costellazioni napoletane write blu
YouTube video by Giuseppe Fusco
youtu.be
November 27, 2025 at 4:34 PM
a Napolitanian created this amazing constellation video for kids, in Italian: youtu.be/lnzqja_LutM?...
costellazioni napoletane per bambini
YouTube video by Giuseppe Fusco
youtu.be
November 27, 2025 at 12:27 PM
Reposted by Susanne M Hoffmann
⚪️ Alaybasan (β Tri) — mag 3.0 white A-type binary in #Triangulum.
🌡️ 7,680 K | 3.25 M☉ | 3.4 R☉ | 124 ly | A5 III
Name from Arabic al-Aybasān, “the Two Bone-Joints.”
A 31.4-day spectroscopic binary as tight as Mercury’s orbit.
#Alaybasan #IAUStarNames #BinaryStars
November 17, 2025 at 1:47 PM
Reposted by Susanne M Hoffmann
⚪️ Apdu (γ Tri) — mag 4.0 white, fast-rotating star in #Triangulum.
🌡️ 9,440 K | 2.5 M☉ | 2.25 R☉ | 117 ly | A1Vnn
From ancient Egyptian Apdu (𓅫pd), “the Bird,” now official IAU name.
#Apdu #GammaTrianguli #IAUStarNames #StarEtymology #Triangulum
November 16, 2025 at 12:59 PM
Reposted by Susanne M Hoffmann
🔴On 4th October, the chair of WGSN participated in the 24 Hours Live event at Akashi Planetarium (Japan), part of 100 Hours of Astronomy, @susanne-m-hoffmann.bsky.social explained how stars are officially named by the IAU followed by a public Q&A hosted by IAU-OAO.

#IAU #WGSN #Astronomy
October 16, 2025 at 6:57 AM
Reposted by Susanne M Hoffmann
🟡 Ain (ε Tau) – yellow giant in #Taurus, mag 3.5, ~154 ly away.
🌡️ 4,880 K | 2.45 M☉ | 12 R☉
Hosts giant planet Amateru (ε Tau b), a hot super-Jupiter (~7 M♃) orbiting every 586 d.
Name “Ain” = Arabic ʿAyn al-Thawr, “Bull’s Eye.”
#Ain #Amateru #IAUStarNames #Exoplanet #Taurus
November 3, 2025 at 1:11 PM
Reposted by Susanne M Hoffmann
We thank Giuseppe Fusco Marano from Naples (Napoli), Italy, for this great idea. Currently only available in Italian, we still think that the educational value comes predominantly from the pictures. "I appreciate this work very much and send 'mille grazie' to Italy", Susanne M Hoffmann says.
October 27, 2025 at 6:04 PM
Reposted by Susanne M Hoffmann
🔵 Hydor (2 Ceti, HIP 301)
A blue-white subgiant (mag 4.48) in Cetus and 3rd-brightest member of the Psc–Eri stellar stream (~4,700 stars).
🌡️ 11,419 K | 2.68 M☉ | 2.75 R☉ | 272 ly
🔬 B9 IVn
Greek name ὕδωρ “Water,” once misplaced in Aquarius, restored by IAU in 2019.
#Hydor #Cetus
September 25, 2025 at 6:17 AM
Reposted by Susanne M Hoffmann
🔴 Shatabhisha (λ Aquarii, HIP 112961)
A red giant glowing at mag 3.8 in Aquarius, ~391 ly away.
🌡️ 3,702 K | 2.96 M☉ | 100 R☉ | M2.5III
📜 Sanskrit “Shatabhisha” (शतभिषज्) = “hundred physicians,” a Vedic name >3,000 yrs old, later reimagined as hundred stars.
💫 Companion star detected.
✅ Adopted by IAU.
September 22, 2025 at 7:30 PM
Reposted by Susanne M Hoffmann
🌟 New in August 2025:
WGSN adopts star names from Chinese & ancient Greek traditions — highlighting asterisms in Andromeda, Perseus, Cetus & Triangulum, from classical astronomy to early modern heritage.

Names now in the IAU Star Names Catalog 🔗 exopla.net/star-names
#WGSN #IAU #StarNames
September 11, 2025 at 4:43 AM
Reposted by Susanne M Hoffmann
✨ On 22 July, PM Anthony Albanese proudly called Epsilon Crucis "Ginan", an Australian star — featured in the flag 🇳🇿.
Named by the IAU in honour of the Wardaman people and their sky stories.

#Ginan #EpsilonCrucis #IAUStarNames #CulturalAstronomy #SouthernCross
July 25, 2025 at 10:25 AM
July 31, 2025 at 5:50 AM
July 31, 2025 at 5:43 AM
Reposted by Susanne M Hoffmann
🌟 New in June 2025:
WGSN adopts star names from Chinese, Greek & Latin traditions — reviving ancient asterisms in Hercules & Triangulum.
✨ Names now in the IAU Star Names Catalog
🔗 exopla.net/star-names

#WGSN #IAU #StarNames
July 23, 2025 at 3:58 PM