nearby (170 pc; Randich et al. Name 1993, A&AS, 98, 477). Log_EM 1", AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 11 日, https://en.wikipedia.org/w/index.php?title=Alpha_Persei&oldid=973447468, Articles with Chinese-language sources (zh), Articles containing Chinese-language text, Articles containing explicitly cited English-language text, Creative Commons Attribution-ShareAlike License, This page was last edited on 17 August 2020, at 08:06. The wide spread star cluster of Alpha Persei (Melotte 20) can be seen easily by naked eye in the constellation of Perseus. The name of the star is meant to commemorate a great tsunami and mark the beginning of the migration of Maui. Mirfak itself is less than 50-million years old, but it’s already entered old age. The proposed planet is estimated to have a minimum mass of approximately 6.6 times that of Jupiter and an orbital period of 128 days, but the claimed period may not be stable over 20 years so the exoplanet is considered doubtful.
[11] Determined distance using the trigonometric parallax, places the star 510 light-years (160 parsecs) from the Sun.
In the same manner as for 73 X-ray sources from a raster survey in alpha Per (Prosser & Randich, 1998, Cat. [16], In Chinese, 天船 (Tiān Chuán), meaning Celestial Boat, refers to an asterism consisting of α Persei, γ Persei, δ Persei, η Persei, μ Persei, ψ Persei, 48 Persei and HD 27084. background rms. It's considered unsupervised because there's no ground truth value to predict. Log_Fx A unique sequential identification number for each X-ray Association.". Alpha Per cluster. LII
More RA stars of spectral type O and B, and thus classified as "OB These kinds of stars are so energetic, they don’t live long. recently, Stauffer et al. The Alpha Persei (PER-see-EYE) Cluster is an open cluster of hot, bluish-white B-type stars. Hodierna. The Delta Delta Delta and Alpha Delta Pi sorority houses are both located in sorority village at UT. A service of the Astrophysics Science Division at NASA/GSFC. The former, meaning 'Elbow' and also written Mirphak, Marfak or Mirzac, comes from the Arabic Mirfaq al-Thurayya, while Algenib, also spelt Algeneb, Elgenab, Gęnib, Chenib or Alchemb, is derived from الجنب al-janb, or الجانب al-jānib, 'the flank' or 'side'. One word: Disaster. Either conversation stops completely and the group members look around expectantly for a new alpha, or the group disperses. equinox. Dec The fact that Alpha Persei is a supergiant, and a member of the cluster, proves that the cluster must be extremely young, since supergiants burn out in less than 100 million years. from the low mass lithium depletion boundary.
This difference is highlighted in their spectral designation under the Yerkes spectral classification, published in 1943, where stars are ranked on luminosity as well as spectral typing. stellar group by Eddington 1910, and cataloged by Melotte 1915. Astrophysical Observatory. To the naked eye, the cluster consists of several blue spectral type B type stars. The distance of this cluster has recently been measured by ESA's Hiding in the constellation Cassiopeia is a star cluster that goes by many names. 2001 at 0:25 UT with a 300 mm f/4.5 telephoto lens, exposed 30 Alpha Per is a young open cluster, found to be 50 Myr old from its upper main sequence turnoff morphology (Meynet et al. Under dark skies, you can see the cluster with the naked eye, but if you’re near the city, or if the moon is out, you’ll need some help. The image in this page was obtained by by the HEASARC from the ct/ks units in the original table), for the (or is it just me...), Smithsonian Privacy Clustering (aka cluster analysis) is an unsupervised machine learning method that segments similar data points into groups. Instead, we're trying to … source, in order of increasing J2000.0 Declination. In addition to being relatively In the Hertzsprung–Russell diagram, Alpha Persei lies inside the region in which Cepheid variables are found. It is radiating 5,000[11] times the luminosity of the Sun from its outer atmosphere at an effective temperature of 6,350 K,[2] which creates the yellow-white glow of an F-type star. The Galactic Longitude of the Chandra source. When in doubt about a bright star, consult Jim Kaler's website. minutes on Kodak Ektachrome 200/400. α Persei is the star's Bayer designation. This was given in J2000.0 equatorial coordinates to a precision of 0.1 Alpha Persei has an apparent visual magnitude of 1.8,[5] and is a circumpolar star when viewed from mid-northern latitudes.
The X-ray emission measures and luminosities have been [14] It is thus useful in the study of these stars, which are important standard candles. (1999, ApJ, 527, 219) have found an age of 90 Myr from the low mass lithium depletion boundary. This moving cluster was probably first cataloged as a nebulous object by So most of the B-type stars we can see in the night sky are, on the cosmic scale, practically newborns. al. For almost 60 X-ray sources, an optical counterpart with photometry acceptable for cluster membership is identified, some of which can be excluded from membership on the basis of discrepant radial velocity or X-ray characteristics. "Observing by Hand" Alpha Persei moving cluster, Mel 20 - posted in Sketching: Hi, the title is allusive to a very interesting book Im reading Observing by Hand - Sketching the Nebulae in Nineteenth Century by Omar W. Nasim, The University of Chicago Press. This weekend, the gibbous moon lights up the night.
[13], Alpha Persei has about 8.5[2] times the Sun's mass and has expanded to roughly 60[6] times the size of the Sun. degrees. Support At v1.19, Kubernetes supports clusters with up to 5000 nodes. spectrum, in cm-. The WGSN's first bulletin of July 2016[20] included a table of the first two batches of names approved by the WGSN; which included Mirfak for this star (Gamma Pegasi was given the name Algenib). And... On Friday night October 2nd, Mars hangs out with the nearly full Moon. The X-ray source designation registered with the Dictionary of (Prosser+, 1998) seconds of time in the original table. seconds of time in the original table. Mirfak, Mirphak, Marfak, Algeneb, Algenib, α Persei, α Per, Alpha Per, 33 Persei, Monthly Notices of the Royal Astronomical Society, "Stellar Angular Diameters of Late-Type Giants and Supergiants Measured with the Navy Prototype Optical Interferometer", "Anchor Points for the MK System of Spectral Classification", "Bulletin of the IAU Working Group on Star Names, No. Use, Smithsonian Per cluster. data interpretation relatively robust.
It makes a splendid group in a low power binocular. arcseconds in the original table. equinox. This was given in J2000.0 equatorial coordinates to a precision of 0.1 The Declination of the Chandra source in the selected equinox. The Alpha Persei cluster is easily found around the star Alpha Persei PN cameras on board XMM-Newton with a pointing centered at RA: 3h 26m Tyson M and brida1709a like this The Galactic Latitude of the Chandra source. Or, maybe two words: Disaster and Drama. Alpha Persei lies in the midst of a cluster of stars named as the eponymous Alpha Persei Cluster, or Melotte 20, which is easily visible in binoculars and includes many of the fainter stars in the constellation. Agreement NNX16AC86A, Is ADS down? The Hipparcos satellite and infrared color-magnitude diagram fitting have been used to establish a distance to the cluster of ~172 pc. The age of this cluster is about 50-70 million years.[1][5]. The X-ray source count rate, in counts per second (converted Nomenclature of Celestial Objects, viz., '[PEW2013' nnn', where the summed MOS and PN detectors, assuming a PN-MOS conversion factor of 3.1. And it’s bright too—five THOUSAND times brighter than the sun. The Alpha Persei Cluster, or Alpha Persei Moving Group, consists of massive blue class B stars that formed together at around the same time and continue to move together through space. Mars, Jupiter, Saturn, Uranus, AND Neptune will all be in the evening sky this weekend. Off_Axis Significance
summed MOS and PN detectors, assuming a PN-MOS conversion factor of 3.1. 2003, CDS Catalog II/246). The later it is, the higher it will be, but if you miss it this weekend, don’t worry. The logarithm of the flux of the X-ray source in the 0.3-8.0 keV The 2MASS identifier, viz., '2MASS JHHMMSSss+DDMMSSs', of the 2008) compared to Alpha Persei (T = 100 Myr; Barrado y Navascués et al. Looking at the moon with the naked eye, you'll notice a few big features. The Alpha Persei (PER-see-EYE) Cluster is an open cluster of hot, bluish-white B-type stars. [21], Assemani alluded to a title on the Borgian globe, Mughammid (مغمد), or Muliammir al Thurayya (ملىمرٱلطرى), the Concealer of the Pleiades, which, from its location, may be for this star. A small telescope or even a pair of binoculars should provide enough magnification to notice a loose cluster of bright blue stars around Mirfak. It’s a supergiant, having ballooned up to about 60 times the size of our sun. The Declination of the 2MASS matching source in the selected It means you’ll be able to observe WITHOUT the help of bug spray… very soon.
2003, CDS Catalog II/246). It was described as However, when THE alpha female (and there can only be one, see below for details) leaves, you will see something odd happen. have been computed assuming that the source is at the 170 pc distance of the the per-voxel p-value is taken from the interactive threshold slider in the AFNI 'Define Overlay' control panel, and then the per-cluster alpha value is interpolated in this table from 3dClustSim. More images by Till Credner and This is not a true open cluster, but rather an enormous, sparse grouping of hot young stars 600 light-years away, surrounding the bright yellow-white star Mirphak (alpha Per). What happens when two alpha females are in the same office? Alpha Persei (Latinized from α Persei, abbreviated Alpha Per, α Per), formally named Mirfak[9] (pronounced /ˈmɜːrfæk/ or /ˈmɪərfæk/),[10] is the brightest star in the northern constellation of Perseus, outshining the constellation's best known star, Algol. Mel 20, SIMBAD Data of the Alpha Persei cluster, Mel 20, Publications on the Alpha Persei cluster, Mel 20 (NASA ADS).
nnn is the source number. keV energy band, in erg s-1. The field of view is 4.2 x 5.3 1996, A&A, 305, 785), the Alpha Per cluster is The logarithm of the luminosity of the X-ray source in the 0.3-8.0 Source_Number (1999, ApJ, 527, 219) have found an age of 90 Myr Find helper applications like Adobe Acrobat. TwoMASS_Dec Consequently, the Chinese name for α Persei itself is 天船三 (Tiān Chuán sān, English: the Third Star of Celestial Boat.)[22]. Count_Rate the Overview).
and visible to the naked eye. al. Hinaliʻi is the name of the star in Native Hawaiian astronomy.
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