🔺 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

⭐️ 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.

🔵 Heng – ν Cen Bright blue-white star in #Centaurus, mag 3.38. 🌡️ 22,400 K | 11.8 M☉ | 8.2 R☉ | 474 ly Name Héng (衡), an ancient Chinese term likely meaning “balance bar,” from the 2nd-century BCE super-constellation Kulou. A pulsating B-type subgiant. #IAUStarNames #ChineseAstronomy

🟠 Shimu – ζ And Reddish K-giant in #Andromeda, ~mag 4.0. 🌡️ 4900 K | 4.8 M☉ | 85 R☉ | 181 ly Name Shǐmù (“Eye of the Pig”), from the ancient Chinese asterism Tiān Shǐ, with roots tracing back 5,500 years. A spotted, magnetically active binary; primary mapped via Doppler imaging. #Shimu #IAUStarNames

🟠 Shimu – ζ And Reddish K-giant in #Andromeda, ~mag 4.0. 🌡️ 4900 K | 4.8 M☉ | 85 R☉ | 181 ly Name Shǐmù (“Eye of the Pig”), from the ancient Chinese asterism Tiān Shǐ, with roots tracing back 5,500 years. A spotted, magnetically active binary; primary mapped via Doppler imaging. #Shimu #IAUStarNames

🟡 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

⚪️ Kulou – ι Cen Bright white star in #Centaurus, mag 2.73. 🌡️ 9160 K | 2.36 M☉ | 2.1 R☉ | 58 ly Name Kùlóu (“Arsenal”), from a 2nd-century BCE Chinese super-constellation spanning Centaurus & Lupus. Shows strong IR excess from a warm debris disk. #Kulou #IAUStarNames

🟠 Siwarhā (Betelgeuse B) Faint companion of #Betelgeuse in Orion, mag ~8.2. Predicted long ago, revealed by speckle imaging in 2020 & 2024. 🌡️ ~7,400 K | ~1.6 M☉ | ~1.5 R☉ | 548 ly 🔬 Likely F-type Name “Siwarhā” = “her bracelet,” from Arabic lore of al-Jawzāʼ. #Siwarha

🔵 Tiansi – γ Cas Eruptive Be star in #Cassiopeia, mag 2.4. 🌡️ 26,500 K | 18.7 M☉ | 10.9 R☉ | 549 ly Name Tiān Sì (“Heavenly Quadriga”), a 2,000-year-old Chinese asterism. A high-mass X-ray system; X-rays likely from the Be star + disk. #Tiansi #IAUStarNames

🔵 Cexing – κ Cas Blue supergiant in #Cassiopeia, mag 4.16. 🌡️ 24,600 K | 38 M☉ | 43 R☉ | 4,126 ly | BC0.7 Ia Name from Chinese Cè Xīng (“The Whip Star”), part of the charioteer Wangliang. A fast runaway star with a huge bow shock. #Cexing #IAUStarNames

🟠 Bagu – δ Aur Orange giant, mag 3.72 in #Auriga. 🌡️ 4,786 K | 1.1 M☉ | 21 R☉ | 140 ly | K0 IIIb Name from Chinese Bā Gǔ (“Eight Kinds of Crops”), an ancient Han-era asterism. Brightest star of Bagu & namesake of the Delta Aurigids. #Bagu #IAUStarNames

🔵 Tiansi – γ Cas Eruptive Be star in #Cassiopeia, mag 2.4. 🌡️ 26,500 K | 18.7 M☉ | 10.9 R☉ | 549 ly Name Tiān Sì (“Heavenly Quadriga”), a 2,000-year-old Chinese asterism. A high-mass X-ray system; X-rays likely from the Be star + disk. #Tiansi #IAUStarNames

🔵 Cexing – κ Cas Blue supergiant in #Cassiopeia, mag 4.16. 🌡️ 24,600 K | 38 M☉ | 43 R☉ | 4,126 ly | BC0.7 Ia Name from Chinese Cè Xīng (“The Whip Star”), part of the charioteer Wangliang. A fast runaway star with a huge bow shock. #Cexing #IAUStarNames

🟠 Bagu – δ Aur Orange giant, mag 3.72 in #Auriga. 🌡️ 4,786 K | 1.1 M☉ | 21 R☉ | 140 ly | K0 IIIb Name from Chinese Bā Gǔ (“Eight Kinds of Crops”), an ancient Han-era asterism. Brightest star of Bagu & namesake of the Delta Aurigids. #Bagu #IAUStarNames

⚪️ 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

⚪️ 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

⚪️ 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

⚪️ 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

🟠 Adhil (ξ And) — mag 4.86 orange giant in #Andromeda. 🌡️ 4,840 K | 2.5 M☉ | 10 R☉ | 195 ly | K0 IIIb From Arabic al-dhayl, “the hem (of a robe),” marking the lower hem of Andromeda’s dress. #Adhil #IAUStarNames #ArabicAstronomy #RedGiant

🟠 Ainalrami (ν¹ Sgr) — mag 4.84 orange supergiant in #Sagittarius, marking the Archer’s Eye. 🌡️ 3,460 K | 6.5 M☉ | 101 R☉ | 1,770 ly | K1 II From Arabic ʿAyn ar-Rāmī, “the Eye of the Archer.” #Ainalrami #IAUStarNames #ArabicAstronomy #Supergiant

🔴 Aldebaran (α Tauri) — mag 0.86 orange giant in #Taurus, the fiery eye of the Bull. 🌡️ 3,900 K | 1.16 M☉ | 45 R☉ | 65 ly | K5+III From Arabic al-dabarān, “the Follower,” trailing the Pleiades. Once Sun-like, now a red giant. #Aldebaran #ArabicAstronomy #IAUStarNames #RedGiant

🔵 Aladfar (η Lyrae) – blue-white star in #Lyra, mag 4.4, ~1,040 ly. 🌡️ 17,360 K | 10 M☉ | 4.3 R☉ | B6 type Name from Arabic al-aẓfār, “the talons (of the eagle).” Part of the ancient Arabian Eagle asterism. #IAUStarNames #ArabicAstronomy #BlueStar #Lyra

🟡 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

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.

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.

🎃 Apāmvatsa (74 Vir) – a gentle red giant in Virgo (mag 4.69). IAU releases the ancient Sanskrit name “Apāmvatsa,” meaning “calf of the waters,” from Indian sky tradition — just in time for Deepavali’s lights and Halloween’s pumpkins. 🌡️ 3,500 K | 400 ly | M2.5 III #Apamvatsa #IAUStarNames

⚪️ Shēngōng (神宫) – HIP 83100 A white giant star in Scorpius, once known in Chinese uranography as the Divine Palace, part of the Tail of the Azure Dragon. Its soft Milky Way glow was seen as a sacred hall among the stars. IAU-Adopted(2025). #Shengong #ChineseAstronomy #WGSN #CulturalAstronomy

⚪️ Shēngōng (神宫) – HIP 83100 A white giant star in Scorpius, once known in Chinese uranography as the Divine Palace, part of the Tail of the Azure Dragon. Its soft Milky Way glow was seen as a sacred hall among the stars. IAU-Adopted(2025). #Shengong #ChineseAstronomy #WGSN #CulturalAstronomy

🎃 Apāmvatsa (74 Vir) – a gentle red giant in Virgo (mag 4.69). IAU releases the ancient Sanskrit name “Apāmvatsa,” meaning “calf of the waters,” from Indian sky tradition — just in time for Deepavali’s lights and Halloween’s pumpkins. 🌡️ 3,500 K | 400 ly | M2.5 III #Apamvatsa #IAUStarNames

🔴 Juan Antonio Belmonte, member of #WGSN, presented “Astronomy and World Heritage: the Iberian Paradigm” at AHME-2 (Yerevan, 6–10 Oct 2025). He showed how ancient Iberian sites — from Antequera Dolmens to Talayotic Menorca — reveal humanity’s timeless bond with the sky. #IAU #StarNames

🔴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

🟠 Siwarhā (Betelgeuse B) Faint companion of #Betelgeuse in Orion, mag ~8.2. Predicted long ago, revealed by speckle imaging in 2020 & 2024. 🌡️ ~7,400 K | ~1.6 M☉ | ~1.5 R☉ | 548 ly 🔬 Likely F-type Name “Siwarhā” = “her bracelet,” from Arabic lore of al-Jawzāʼ. #Siwarha

🔵 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

🔥 Blaze Star (T Coronae Borealis, HIP 78322) A recurrent nova in the Northern Crown, normally mag ~10 but erupting every ~80 yrs to naked-eye brightness (mag 2). 🌡️ 3,561 K | ~0.93 M☉ | ~63 R☉ | ~2,990 ly 💫 Symbiotic binary: red giant + white dwarf. Historic eruptions in 1866 & 1946. #BlazeStar #Nova

🔴 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.

🔵 Junnanmen – φ And (HIP 5434) Hot B-type binary in Andromeda, mag 4.5, 720 ly. 🌡️ ~13,490 K | 7.6 M☉ | 5.5 R☉ | B7 Ve 💫 Wide binary, ~554 yr orbit, rapid rotation. 📜 Name = “Southern Military Gate” (軍南門) in Chinese tradition. ✅ IAU-adopted Aug 2025 #Junnanmen #IAU

🔵 Dajiangjunbei – ∮ Persei (HR 498) Hot B-type star in Perseus ♢ mag 4.06 from 720 ly 🌡️ ~29,300 K | 9.6 M☉ | 5.5 R☉ | B2Vep 💫 Runaway O/B-type binary w/ circumstellar disk 📜 Named “Heaven’s Great General” in Chinese asterism Dajiangjun ✅ Adopted by IAU in Aug 2025 #Dajiangjunbei #StarNames

🟡 Triminus – 6 Trianguli (HIP 10280) Close binary in Triangulum ♢, shining at mag 5.3 from 289 ly away. 🌡️ ~4,930 K | 2.5 M☉ | 4 R☉ | G0 III 💫 RS CVn-type with starspots & ellipsoidal variability. 📜 Name from Hevelius’s Triangulum Minus asterism. ✅ Adopted by IAU in Aug 2025. #Triminus #StarNames

🌟 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

🔵 Acrux (α Crucis) – HIP 60718 The brightest star of Crux, the Southern Cross 🌌 mag 0.76, 321 ly. Spectral type B0.5IV: 🌡️ 28,800 K | 17 M☉ | 7 R☉ Visible south of the Tropic of Cancer, Acrux has long guided navigation. ✅ Officially adopted by the IAU. #Acrux #Crux #IAUStarNames

🟡 Achird (η Cassiopeiae) – HIP 3821 A nearby Sun-like star in Cassiopeia ✨ mag 3.44, only 19 ly away. F9V main sequence: 🌡️ 6012 K | 1.0 M☉ | 1.0 R☉ Binary system discovered by Herschel in 1779. ✅ Official IAU name, among the closest named stars to our Sun. #Achird #IAU #Cassiopeia #BinaryStars

🔵 Acamar (θ Eridani) – HIP 13847 From Arabic Ākhir al-Nahr = “the river’s end.” 🌊 In Greek & Islamic astronomy, it marked Eridanus’s termination before Achernar was visible. A3IV–V white subgiant: 🌡️ 8200 K | 2.6 M☉ | 4.85 R☉ | mag 3.18 | 161 ly ✅ Officially IAU-adopted #Acamar #IAU #StarNames

🔴 Indigenous constellations show how much beauty we lose to light pollution. ✨ Our ancestors’ rich star lore is fading from the night sky. 🎥 Watch Dr. Danielle Adam (~39min): youtu.be/MAn3z1ClONM #Astronomy #LightPollution #DarkSkies

🌟 IAU – May 2025 6 new official star names: Paradys 🪶 αAps – Bird of Paradise Honores 📜 7And – Honours Alfarasalkamil 🐎 οAnd – Complete Horse Udkadua 🌩 λAnd – Storm Demon Rasalnaqa 🐪 ιAnd – Head of She-Camel Kaffalmusalsala ⛓ κAnd – Hand of Chained Woman #IAU #StarNames

🔵 Rasalnaqa (ι And) – HIP 116631 Arabic “Head of the She-Camel” 🐪 — in Arabian sky traditions, blended with Greek Andromeda 🌌 B8V blue-white main-sequence star: 🌡️ 12,620 K | 3.1 M☉ | 4.6 R☉ | mag 4.29 | 502 ly ~116 Myr old ✅ IAU-approved 2025 #WGSN #IAU #Rasalnaqa #ArabicStarNames #Andromeda

🟠 Paradys (α Apodis) – HIP 72370 Dutch for “bird of paradise,” named by Plancius in 1598 🗺️ K3III orange giant: 🌡️ 4,090 K | 59.5 R☉ | 4.46 M☉ | mag 3.79 📍 Tail of Apus, decl. –79° ✅ IAU star name (2025) #WGSN #IAU #Paradys #Apus #StarNames #AllSkies

🔵 Kaffalmusalsala (κ And) – HIP 116805 Arabic for “Hand of the Chained Woman” 🤲 — traditional Andromeda star from Almagest 🌌 B9IVn blue-white subgiant: 🌡️ 10,342 K | 2.7 M☉ | mag 4.14 💫 Directly imaged exoplanet host; possible Beta Pic group member ✅ IAU-approved 2025 #WGSN #IAU #StarNames

🟠 Udkadua (λ And) – HIP 116584 Sumerian for “Storm Demon with the Gaping Mouth” ⚡ — from a 3,000-year-old Babylonian timekeeping asterism 📜 G8IVK yellow-orange subgiant: 🌡️ 4,633 K | 1.47 M☉ | mag 3.82 📍 Hand of Andromeda, near Cassiopeia ✅ IAU-approved 2025 #WGSN #IAU #Udkadua #Andromeda #StarNames

🟡 Honores (7 And) – HIP 114570 Latin for “honours” — from Bode’s Enlightenment-era constellation (1801) 📜 F1V main-sequence: 🌡️ 7,380 K | 1.6 M☉ | mag 4.52 📍 Left arm of Andromeda ✅ IAU-approved 2025 #WGSN #IAU #Honores #Andromeda #StarNames #CulturalAstronomy

🔵 Alfarasalkamil (الفرس الكامل) – HIP 113726 "The Complete Horse" — from early Arabic & Babylonian sky lore 📍 In Andromeda’s left arm 🔭 B6IV blue subgiant 💡 Mag 3.62 | 692 ly ☀️ ~1,900× Sun's luminosity Named by IAU in 2025, celebrating ancient star traditions beyond Pegasus. #wgsn #iau #starname