4 Equulei
star in the constellation Equuleus
4 Equulei is a binary star system in the constellation of Equuleus, located about 3° to the east of Alpha Equulei. With an apparent visual magnitude of 5.94, it is just barely visible to the naked eye under good seeing conditions. The system shows an annual parallax shift of 20.44 mas as measured from Earth's orbit, which yields a distance estimate of about 160 light years. It is moving closer to the Sun with a radial velocity of −13 km/s.
This is a single-lined spectroscopic binary with an orbital period of 5.4093 ± 0.0026 years (1,975.76 ± 0.94 d) and an eccentricity of 0.39. The value of a sin i for the primary is (264.4±1.6)×106 km, providing a lower bound for the semimajor axis. Griffin (2011) noted that the mass of the secondary component is likely to be at least equal to that of the Sun, which, for an ordinary main sequence star, should make it visible in the spectrum. The lack of significant ultraviolet emission appears to rule out a white dwarf companion. Instead, the secondary may consist of a binary pair of low mass dwarfs.
The visible component is an F-type main-sequence star with a stellar classification of F8 V. The spectrum of the star is unusual for its near absence of lithium.
“4 Equulei” enters the record as star in the constellation Equuleus. Crown Archives preserves that source wording while asking what Equulei, star and constellation can confirm, complicate or overturn.
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The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Sep 14, 2026. The linked authority identifier is Q4639038. None of the 0 selected statements returned an explicit reference. The first chronological checks are 2011.
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This entry incorporates text from “4 Equulei” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.