In the Taittirīya tradition Soma's nakshatra is called Invakā where other lists have Mṛgaśīrṣa: TB 1.5.1.1 'somasyenvakā', and TB 3.1.4.3 invokes Mṛgaśīrṣa and the Invakās side by side in the same offering, proving the equation.
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इन्वकाः (इन्वगाः) Invakāḥ (Invagāḥ)
alternative Taittirīya name of Mṛgaśīrṣa - the stars of Orion's head · λ, φ1, φ2 Orionis · Orion
nakshatra aliasidentification likelyattestations 2 Meissa λ OriHIP 26207mag 3.39
Attestations
Vedic corpus
अग्नेः कृत्तिकाः । शुक्रं परस्ताज्ज्योतिरवस्तात् । प्रजापते रोहिणी ।आपः परस्तादोषधयोऽवस्तात् । सोमस्येन्वका । विततानि परस्ताद्वयन्तोऽवस्तात् । रुद्रस्य बाहू ।मृगयवः परस्ताद्विक्षारोऽवस्तात् । अदित्यै पुनर्वसू ।वातः परस्तादार्द्रमवस्तात् १ || सोमो वा अकामयत । ओषधीनाꣳ राज्यमभिजयेयमिति । स एतꣳ सोमाय मृगशीर्षाय श्यामाकं चरुं पयसि निरवपत् । ततो वै स ओषधीनाꣳ राज्यमभ्यजयत् । समानानाꣳ ह वै राज्यमभिजयति । य एतेन हविषा यजते । य उ चैनदेवं वेद । सोऽत्र जुहोति । सोमाय स्वाहा मृगशीर्षाय स्वाहा । इन्वकाभ्यः स्वाहौषधीभ्यः स्वाहा । राज्याय स्वाहाभिजित्यै स्वाहेति ३
[Paraphrase of TB 1.5.1.1] The Krittikas are Agni's; brightness above, light below. Rohini is Prajapati's; the waters above, the plants below. The Invakas are Soma's; things spread out above, the weavers below. The Bahu (the two Arms) are Rudra's; hunters above, ... below. The two Punarvasus are Aditi's; wind above, moisture below. [TB 3.1.4.3] Soma desired: 'May I win the kingship of the plants'; he offered a caru of millet in milk to Soma of Mrgasirsha... 'To Soma svaha! To Mrgasirsha svaha! To the Invakas svaha! To the plants svaha!' No public-domain English translation of the Taittiriya Brahmana exists; rendering above is the researcher's own paraphrase of the Sanskrit. Cf. P.-E. Dumont (1954), copyrighted, not quoted. — Researcher's paraphrase (no public-domain translation); cf. P.-E. Dumont (1954)
Taittirīya Brāhmaṇa 1.5.1.1; 3.1.4.3 · text · translation
Ṛgveda & Vedāṅga Jyotiṣa · c. 1200–900 BCE
kṛttikā nakṣatram agnir devatā ... rohiṇī nakṣatraṃ prajāpatir devatā invagā nakṣatraṃ maruto devatā bāhur nakṣatraṃ rudro devatā punarvasur nakṣatram aditir devatā tiṣyo nakṣatraṃ bṛhaspatir devatā ... //MS_2,13.20//
Invagā is the asterism, the Maruts the deity; Bāhu is the asterism, Rudra the deity. — No public-domain English translation of the Maitrāyaṇī Saṃhitā located; literal rendering supplied by the compiler
The Maitrāyaṇī spelling of Invakā, with the deity Maruts, standing where the Taittirīya list has Mṛgaśīrṣa. Macdonell & Keith's comparative table gives slot 3 as 'Mrgasirsa (neut.) | Invaga | Invaka' for TS | MS | KS — the g/k variation is a real recensional difference, not an e-text error. Invakā also survives into the Atharvaveda Nakṣatra Kalpa (avparis_1,6.5, 'invakāsu'). SCRIPT NOTE: source e-text is romanised IAST; the Devanagari headword is supplied by the compiler.
Maitrāyaṇī Saṃhitā 2.13.20 · text · translation