{"id":60,"date":"2016-10-08T12:51:45","date_gmt":"2016-10-08T11:51:45","guid":{"rendered":"http:\/\/trafyx.com\/?page_id=60"},"modified":"2016-10-12T21:07:33","modified_gmt":"2016-10-12T20:07:33","slug":"melotte-15","status":"publish","type":"page","link":"http:\/\/trafyx.com\/?page_id=60","title":{"rendered":"Melotte 15"},"content":{"rendered":"
\"melotte15\"<\/a>
Melotte 15 – Open Star Cluster in the IC 1805 Nebula<\/figcaption><\/figure>\n
Melotte 15 is a very young star cluster in the IC 1805 nebula, also known as the Heart Nebula. It is comprised of OB stars, approximately 1.5 myr old and is one of the core clusters of the Cas OB6 stellar association.<\/h5>\n

Surrounding IC 1805 nebula glows bright\u00a0in the red portion of the visible spectrum\u00a0as the hydrogen is ionized by ultraviolet light from\u00a0OB stars. This image captures this H II emission via narrowband filter centered at 656.3 nm wavelength. Clouds of neutral and atomic hydrogen appear as dark streaks and globules.<\/p>\n

[layout cols=”2-3″ position=”first” textalign=”left”]<\/p>\n

Image Data<\/h4>\n

Telescope: 10\u2033 Aries f\/15 Maksutov-Cassegrain on Astro-Physics 900GTO German Equatorial
\nAccessories: Moravian G1-0300 as Off-Axis Guider, 0.67X Astro-Physics CCD Telecompressor
\nFocal Length and Resolution: 2692 mm, 0.52″\/pixel
\nInstrument: QSI 532wsg at -20 deg. C
\nExposures: 3nm Narrowband [H II]: 6.75 hours [O III]: 6 hours, total: 12.75 hours
\nFilter(s): Astrodon Narrowband and Tru-Balance E-Series
\nExposure Date: September 24 to October 2, 2011
\nSeeing, FWHM: Not Measured
\nProcessing Software: MaximDL, PixInsight, Photoshop
\nImage Acquisition Software: MaximDL, TheSky6, CCDAutoPilot, FocusMax, PinPoint
\n[\/layout]<\/p>\n

[layout cols=”1-3″ position=”last” textalign=”left”]<\/p>\n

Object Data<\/h4>\n

Constellation: Cassiopeia
\nType: Open Star Cluster, type III 3 p n
\nDistance: 7,500 ly
\nDimensions: 21′
\nMagnitude: ~ 6.5 (V)
\n[\/layout]<\/p>\n

[layout cols=”2-3″ position=”first” textalign=”left”]<\/p>\n

Processing Procedure<\/h4>\n

LRGB Combination (R=[H II], G=[O III], B=[O III])
\nHistogram Transformation
\nSplit to RGB
\nATrousWaveletTransform on G and B channels (K-Sigma Noise Thresholding) to denoise
\nGenerate Star Mask
\nATrousWaveletTransform to bring details out (with noise suppression)
\nResample to 1600px horizontal (resample mask too)
\nATrousWaveletTransform to bring details out (with noise suppression)
\nPhotoshop:
\nCreate Grayscale Layer via Desaturate
\nOverlay Grayscale as Luminosity over RGB Layer
\nSelect stars, expand 5 pixels, feather 5 pixels, invert
\nShadows\/Highlights:
\nShadows 1%, Width 56%, Radius 300px, Highlights 0%, Midtone Contrast +30
\nFlatten, Levels (Subjective)
\nNoise Filter – selective low luminosity (low SNR) parts, Unsharp Mask<\/p>\n

[\/layout]<\/p>\n

[layout cols=”1-3″ position=”last” textalign=”left”]<\/p>\n

Remarks<\/h4>\n

Czech Astrophotography of the Month<\/a>
\n8Mag Astrophotographer of the Month<\/a>
\nMF Dnes Newspaper<\/a>
\n[\/layout]<\/p>\n

 <\/p>\n

NASA\/ADS Query<\/h4>\n

[wp_nasaads_query_importer_full ads_query_url=”\/cgi-bin\/basic_connect?qsearch=IC1805″ max_num_authors=”20″ max_records_to_print=”10″]<\/p>\n","protected":false},"excerpt":{"rendered":"

Melotte 15 is a very young star cluster in the IC 1805 nebula, also known as the Heart Nebula. It is comprised of OB stars, approximately 1.5 myr old and is one of the core clusters of the Cas OB6 stellar association. Surrounding IC 1805 nebula glows bright\u00a0in the red portion of the visible spectrum\u00a0as […]<\/p>\n","protected":false},"author":1,"featured_media":59,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-fullwidth.php","meta":[],"_links":{"self":[{"href":"http:\/\/trafyx.com\/index.php?rest_route=\/wp\/v2\/pages\/60"}],"collection":[{"href":"http:\/\/trafyx.com\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"http:\/\/trafyx.com\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"http:\/\/trafyx.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/trafyx.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=60"}],"version-history":[{"count":51,"href":"http:\/\/trafyx.com\/index.php?rest_route=\/wp\/v2\/pages\/60\/revisions"}],"predecessor-version":[{"id":319,"href":"http:\/\/trafyx.com\/index.php?rest_route=\/wp\/v2\/pages\/60\/revisions\/319"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/trafyx.com\/index.php?rest_route=\/wp\/v2\/media\/59"}],"wp:attachment":[{"href":"http:\/\/trafyx.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=60"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}