{"id":3893,"date":"2016-07-27T14:07:03","date_gmt":"2016-07-27T13:07:03","guid":{"rendered":"http:\/\/outters.fr\/?p=3893"},"modified":"2025-07-15T17:04:13","modified_gmt":"2025-07-15T16:04:13","slug":"vdb15","status":"publish","type":"post","link":"https:\/\/www.outters.fr\/?p=3893","title":{"rendered":"Vdb15"},"content":{"rendered":"

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Vdb15<\/strong>
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\"Vdb15\"<\/a><\/span><\/div><\/div><\/div>
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Commentaires sur l’objet photographi\u00e9<\/span><\/p><\/h1><\/span>

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\"outters-nicolas\"Je vous pr\u00e9sente une n\u00e9buleuse en r\u00e9flexion nomm\u00e9e Vdb15, pas facile car plac\u00e9e au nord et donc la L reste difficile \u00e0 g\u00e9rer \u00e0 cause de la pollution lumineuse. La grosse difficult\u00e9 a \u00e9t\u00e9 l’humidit\u00e9 et les \u00e9toiles en ont souffert un peu.<\/p>\n<\/div>

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Image LRGB<\/h2><\/a><\/div><\/div><\/div>
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Donn\u00e9es techniques
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Donn\u00e9es techniques de prise de vue<\/h2><\/div>
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Object :Vdb15
\nDate : image du 17\/18\/19\/23\/24 octobre 2014
\nOptics :Tec140 F7
\nMount : Paramount ME Num\u00e9ro 2
\nLocation : Orange observatory
\nSeeing : 3,5 \u00e0 5 !
\nCcd : Proline 16803
\nfilter wheel :FLI
\nfilters : Astrodon LRGB
\nFocuser :Robofocus
\nGuiding : Atik 314L+
\nTemp. out : +10
\nTemp ccd : -35\u00b0
\nTotal exposure :14h00
\nL 66 x 10 mn B1x1
\nR : 12 x 5mn b2x2
\nG : 12x 5mn b2x2
\nB : 12 x 5mn b2x2<\/div><\/div><\/div>
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Donn\u00e9es scientifiques<\/h2><\/div>
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HD 21389<\/b> is a supergiant<\/a> variable star<\/a> in reflection nebula<\/a> VDB 15<\/a>, in the constellation Camelopardalis<\/a>. It is part of the Camelopardalis OB1 association. The near-identical member CS Camelopardalis<\/a> lies half a degree to the north.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Observation data
\nEpoch<\/a> J2000\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Equinox<\/a> J2000<\/small><\/th>\n<\/tr>\n
Constellation<\/a><\/th>\nCamelopardalis<\/a><\/td>\n<\/tr>\n
Right ascension<\/a><\/th>\n03h<\/sup>\u00a029m<\/sup>\u00a054.74413s<\/sup>[1]<\/a><\/sup><\/td>\n<\/tr>\n
Declination<\/a><\/th>\n+58\u00b0\u00a052\u2032\u00a043.4995\u2033[1]<\/a><\/sup><\/td>\n<\/tr>\n
Apparent\u00a0magnitude<\/a>\u00a0(V)<\/small><\/th>\n4.54[2]<\/a><\/sup><\/td>\n<\/tr>\n
Characteristics<\/th>\n<\/tr>\n
Spectral type<\/a><\/th>\nA0 Iae[2]<\/a><\/sup><\/td>\n<\/tr>\n
U\u2212B color index<\/a><\/th>\n\u22120.11[3]<\/a><\/sup><\/td>\n<\/tr>\n
B\u2212V color index<\/a><\/th>\n+0.56[3]<\/a><\/sup><\/td>\n<\/tr>\n
Variable type<\/a><\/th>\n\u03b1 Cyg<\/a>[4]<\/a><\/sup><\/td>\n<\/tr>\n
Astrometry<\/a><\/th>\n<\/tr>\n
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Radial velocity<\/a> (Rv<\/sub>)<\/small><\/b><\/td>\n\u22126.20[5]<\/a><\/sup> km\/s<\/td>\n<\/tr>\n
Proper motion<\/a> (\u03bc)<\/small><\/b><\/td>\nRA:<\/abbr>\u00a01.79[1]<\/a><\/sup>\u00a0mas<\/a>\/yr<\/a>
\nDec.:<\/abbr>\u00a0\u22121.09[1]<\/a><\/sup>\u00a0mas<\/a>\/yr<\/a><\/td>\n<\/tr>\n
Parallax<\/a> (\u03c0)<\/small><\/b><\/td>\n1.30\u00a0\u00b1 0.56[1]<\/a><\/sup> mas<\/a><\/td>\n<\/tr>\n
Distance<\/a><\/b><\/td>\n975[3]<\/a><\/sup> pc<\/a><\/td>\n<\/tr>\n
Absolute\u00a0magnitude<\/a>\u00a0(MV<\/sub>)<\/small><\/b><\/td>\n\u22127.20[3]<\/a><\/sup><\/td>\n<\/tr>\n
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Details[2]<\/a><\/sup><\/sup><\/th>\n<\/tr>\n
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Mass<\/a><\/b><\/td>\n19.3\u00a0M<\/i>\u2609<\/sub><\/a><\/td>\n<\/tr>\n
Radius<\/a><\/b><\/td>\n97\u00a0R<\/i>\u2609<\/sub><\/a><\/td>\n<\/tr>\n
Luminosity<\/a><\/b><\/td>\n55,000\u00a0L<\/i>\u2609<\/sub><\/a><\/td>\n<\/tr>\n
Surface gravity<\/a> (log\u00a0g<\/i>)<\/small><\/b><\/td>\n1.75\u00a0cgs<\/a><\/td>\n<\/tr>\n
Temperature<\/a><\/b><\/td>\n9,730\u00a0K<\/a><\/td>\n<\/tr>\n
Rotation<\/a><\/b><\/td>\n25<\/td>\n<\/tr>\n
Age<\/a><\/b><\/td>\n11[3]<\/a><\/sup>\u00a0Myr<\/a><\/td>\n<\/tr>\n
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Other designations<\/a><\/th>\n<\/tr>\n
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CE<\/a>\u00a0Camelopardalis, BD<\/a>+58\u00b0607, HIP<\/a>\u00a016281, HR<\/a>\u00a01040, HD<\/a>\u00a021389, SAO<\/a>\u00a024061<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Since 1943, the spectrum<\/a> of CE Cam has served as one of the stable anchor points by which other stars are classified.[6]<\/a><\/sup><\/p>\n

CE Camelopardalis is some 19 times as massive as the Sun and 55,000 timers as luminous. Hohle and colleagues, using the parallax, extinction and analysis of spectrum, came up with a mass 14.95 \u00b1 0.41 times that and luminosity 62,679 times that of the Sun.[7]<\/a><\/sup><\/p>\n

CE Cam is embedded in a large dusty molecular cloud, part of which it illuminates as a reflection nebula (vdB15 or BFS 29). This is a region of ongoing star formation with stars aged from one to a hundred million years old. CE Cam itself is thought to be around 11 million years old, long enough to have exhausted its core hydrogen and evolved away from the main sequence into a supergiant<\/div><\/div><\/div>

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