48 Persei

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Star in the constellation Perseus

title: "48 Persei" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["perseus-(constellation)", "flamsteed-objects", "bayer-objects", "be-stars", "b-type-main-sequence-stars", "bright-star-catalogue-objects", "objects-with-variable-star-designations", "henry-draper-catalogue-objects", "durchmusterung-objects", "hipparcos-objects", "gamma-cassiopeiae-variable-stars", "alpha-persei-cluster"] description: "Star in the constellation Perseus" topic_path: "science/astronomy" source: "https://en.wikipedia.org/wiki/48_Persei" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Star in the constellation Perseus ::

| name = 48 Persei |image= |image=Perseus constellation map.svg|alt=|float=center|width=280 |label=|position=right |mark=Red circle.svg|mark_width=10|mark_link=48 Persei |x=348|y=475 |caption=Location of 48 Persei (circled) | epoch = J2000 | constell = Perseus | ra = | dec = | appmag_v = 4.03 | class = B3Ve | b-v = -0.03 | u-b = -0.55 | variable = γ Cas |type=Main sequence}} | radial_v = +0.80 | prop_mo_ra = +21.73 | prop_mo_dec = -33.61 | parallax = 6.84 | p_error = 0.16 | parallax_footnote = | absmag_v = -1.86 | mass = 7.5 | temperature = 17,490 | luminosity = 600 | rotational_velocity = 197 | gravity = 3.86 | metal_fe = -0.04 | names = c Persei, MX Persei, BD+47°939, FK5 152, GC 4967, HIP 19343, HR 1273, HD 25940, SAO 39336 | Simbad = 48+Persei

48 Persei (also known as c Persei, 48 Per, HR 1273, HIP 19343, or ) is a Be star in the constellation Perseus, approximately the 500th brightest of the visible stars in apparent magnitude. It is "well known for its complex spectrum and for its light and velocity variations". The name "48 Persei" is a Flamsteed designation given to it by John Flamsteed in his catalogue, published in 1712.

::figure[src="https://upload.wikimedia.org/wikipedia/commons/7/7f/MXPerLightCurve.png" caption="A [[light curve]] for MX Persei, plotted from Hipparcos data{{cite web"] ::

| url=https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats | website=Centre de Données astronomiques de Strasbourg | title=/ftp/cats/more/HIP/cdroms/cats | publisher=Strasbourg astronomical Data Center |access-date=15 October 2022}}]] 48 Persei is classified as a Gamma Cassiopeiae variable, and it has been given the variable star designation MX Persei. The star's brightness varies by 0.09 magnitudes in visible light. Koen and Eyer examined the Hipparcos data for this star, and found it varied with a period of 5.0569 days.

As a Be star, it is hot and blue, spinning so rapidly that it forms an unstable equatorial disk of matter surrounding it. Its mass has been estimated as seven times that of the Sun, and its estimated age of 40 million years makes it much younger than the Sun. In another few million years it will likely cease hydrogen fusion, expand, and brighten as it becomes a red giant.

A 1989 study proposed 48 Persei to be a single-lined spectroscopic binary with a period of 16.6 days, but subsequent studies, including close imaging surveys, have not confirmed this result. Hutter et al. (2021) consider it to be a single star.

References

(2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics.
(2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues.
(1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H.
(2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S.
(1967). "The Revision of the General Catalogue of Radial Velocities". Determination of Radial Velocities and Their Applications.
(2012). "XHIP: An extended hipparcos compilation". Astronomy Letters.
(2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society.
(2016). "Critical study of the distribution of rotational velocities of Be stars". Astronomy & Astrophysics.
(2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics.
"48 Persei (HIP 19343)". Ashland Astronomy Studio.
(May 1977). "Search for Beta Cephei stars. I - Photometric and spectroscopic studies of northern B-type stars". Astronomical Journal.
(1835). "An account of the Revd. John Flamsteed, the first astronomer-royal: compiled from his own manuscripts, and other authentic documents, never before published. To which is added his British catalogue of stars, cor. and enl.". Lords Commissioners of the Admiralty.
"MX Per". AAVSO.
(March 2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society.
Kaler, Jim. (2009-01-16). "48 Per (48 Persei)". [[University of Illinois]].
(2021). "Surveying the Bright Stars by Optical Interferometry. III. A Magnitude-limited Multiplicity Survey of Classical Be Stars". The Astrophysical Journal Supplement Series.

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::