रॉस १२८ तारा का स्रोत देखें

{{Starbox begin
| name=रॉस १२८<br><small>Ross 128</small>
}}
{{Starbox image
| image = [[File:Artist's impression of the planet Ross 128 b.jpg|250px]]
| caption = [[रॉस १२८ बी|रॉस 128 बी]] ग्रह का काल्पनिक चित्रण जिसकी पृष्ठभूमि में रॉस 128 तारा दिख रहा है<ref name=eso/>
| credit = [[:en:European Southern Observatory|यूरोपीय दक्षिणी वेधशाला]]
}}
{{Starbox observe
| epoch=J2000
| constell=[[कन्या तारामंडल]]
| ra={{RA|11|47|44.3974}}<ref name="4-planet"/>
| dec={{DEC|+00|48|16.395}}<ref name="4-planet"/>
| appmag_v=11.13<ref name="RECONS"/>
}}
{{Starbox character
| class=M4&nbsp;V<ref name="baas36"/>
| b-v=+1.59<ref name=warren1978/>
| u-b=+2.685<ref name=aass26_275/>
| variable=[[धधकी तारा]]<ref name=gcvs>{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/gcvs.  Originally published in: 2009yCat....102025S|volume=1|author1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}</ref>
}}
{{Starbox astrometry
| radial_v=−31.0<ref name=PCRV/><ref name=aaa379/>
| prop_mo_ra=607.18<ref name="hipparcos"/>
| prop_mo_dec=−1222.69<ref name="hipparcos"/>
| parallax=295.80
| p_error=0.54
| parallax_footnote=<ref name=gaiadr1/>
| absmag_v=13.51<ref name="RECONS"/>
}}
{{Starbox detail
| mass={{val|0.168|0.017}}<ref name="APJ"/>
| radius={{val|0.1967|0.0077}}<ref name="APJ"/>
| luminosity_bolometric={{nowrap|0.00362 ± 0.00039}}<ref name="4-planet"/>
| temperature={{val|3192|60}}<ref name="APJ"/>
| gravity=3.40<ref name="rodono"/>
| metal_fe={{val|−0.02|0.08}}<ref name="Mannetal2015"/>
| rotation=
| age_gyr={{val|9.45|0.60}}<ref name="Mannetal2015"/>
}}
{{Starbox catalog
| names=FI Virginis, FI Vir, [[:en:Henry L. Giclas catalogue|G]] 010-050, [[:en:General Catalogue of Trigonometric Parallaxes|GCTP]] 2730, [[:en:Gliese-Jahreiss catalogue|GJ]] 447, [[:en:Hipparcos catalogue|HIP]] 57548, [[:en:Luyten Half-Second catalogue|LHS]] 315, [[:en:Alexander N. Vyssotsky|Vyssotsky]] 286, LTT 13240, LFT 852<ref name="hipparcos"/>, [[:en:LSPM catalog|LSPM]] PM I11477+0048<ref name="APJ"/>.
}}
{{Starbox reference
|Simbad=Ross+128
}}
{{Starbox end}}
'''रॉस 128''' (Ross 128) [[कन्या तारामंडल]] में [[बेटा वर्जिनिस तारा|बेटा वर्जिनिस तारे]] के समीप स्थित एक [[लाल बौना]] [[तारा]] है। इसका [[द्रव्यमान]] [[सौर द्रव्यमान|सूरज के द्रव्यमान]] का केवल 15% और [[त्रिज्या]] [[सौर अर्धव्यास|सूरज की त्रिज्या]] का 21% है। इसका [[सापेक्ष कांतिमान]] 11.13 है, जो काफ़ी धुंधला है और जिसे देखने के लिए [[दूरदर्शी|दूरबीन]] आवश्यक है। यह [[पृथ्वी]] से लगभग 10.89 [[प्रकाश-वर्ष|प्रकाशवर्ष]] की दूरी पर स्थित है। इसके इर्द-गिर्द परिक्रमा कर रहा एक [[बहिर्ग्रह]] सन् 2017 में ज्ञात हुआ था, जिसका नाम रॉस 128 बी रखा गया।<ref name="RECONS"/>

== असाधारण रेडियो संकेत ==
मई 12, 2017 को [[आरेसिबो वेधशाला]] में रॉस 128 का अध्ययन कर रहे वैज्ञानिकों को कुछ रहस्यमय रेडियो संकेत मिले। दस मिनट के काल तक यह रेडियो संकेत लगभग सामयिक (पिरियॉडिक) था और इसकी [[आवृत्ति]] (फ़्रिक्वेन्सी) घटती जा रही थी। जुलाई 16, 2017 को खगोलजीववैज्ञानिक एबेल मेंडेज़ ने [[ट्विटर]] पर इस विचित्र संकेत की पुष्टि करी और यह भी कहा कि ऐसा संकेत पहले कभी-भी किसी लाल बौने से आता हुआ नहीं देखा गया है। लेकिन उसके बाद ऐसा संकेत आरेसिबो समेत किसी भी वेधशाला द्वारा दोबारा नहीं पाया गया है, जिस से यह आशंका होती है कि यह उस तारे से नहीं आया था बल्कि [[पृथ्वी]] की परिक्रमा करते हुए किसी [[उपग्रह|कृत्रिम उपग्रह]] से उत्पन्न हुआ हो सकता है जो गलती-से तारे से आता हुआ समझा गया।<ref name="TW-20170716"/><ref name="PHL-20170717"/><ref name="NW-20170717"/><ref name="TV-20170717"/><ref name="TA-20170717"/>

== इन्हें भी देखें ==
* [[रॉस १२८ बी|रॉस 128 बी]]
* [[कन्या तारामंडल]]
* [[लाल बौना]]

== सन्दर्भ ==

{{reflist|30em|refs=

<ref name="TW-20170716">{{cite web |last=Mendez |first=Abel |title=Confirmed! We have the data of #Barnard's Star and #Ross128 |url=https://twitter.com/ProfAbelMendez/status/886788583851479041 |date=July 16, 2017 |work=Twitter |accessdate=July 19, 2017 |archive-url=https://web.archive.org/web/20180210025650/https://twitter.com/ProfAbelMendez/status/886788583851479041 |archive-date=10 फ़रवरी 2018 |url-status=live }}</ref>

<ref name="PHL-20170717">{{cite web |last=Mendez |first=Abel |title=Strange Signals from the Nearby Red Dwarf Star Ross 128 |url=http://phl.upr.edu/library/notes/ross128 |date=July 17, 2017 |work=Planetary Habitability Laboratory at University of Puerto Rico at Arecibo |url-status=dead |archivedate=July 17, 2017 |archiveurl=https://web.archive.org/web/20170717181621/http://phl.upr.edu/library/notes/ross128 |accessdate=July 17, 2017 }}</ref>

<ref name="NW-20170717">{{cite news |last=Osborne |first=Hannah |title=Ross 128: Mystery Radio signals Detected From Red Dwarf Star Just 11 Light-Years Away |url=http://www.newsweek.com/mystery-radio-signals-ross-128-star-637682 |date=July 17, 2017 |work=Newsweek |accessdate=July 17, 2017 |archive-url=https://web.archive.org/web/20170717235158/http://www.newsweek.com/mystery-radio-signals-ross-128-star-637682 |archive-date=17 जुलाई 2017 |url-status=live }}</ref>

<ref name="TV-20170717">{{cite web |last=Grush |first=Loren |title=Astronomers don't know what's causing these weird radio waves from a nearby star - Probably not aliens, though |url=https://www.theverge.com/2017/7/17/15982656/arecibo-observatory-ross-128-red-dwarf-radio-waves-signal |date=July 17, 2017 |work=The Verge |accessdate=July 17, 2017 |archive-url=https://web.archive.org/web/20170717230712/https://www.theverge.com/2017/7/17/15982656/arecibo-observatory-ross-128-red-dwarf-radio-waves-signal |archive-date=17 जुलाई 2017 |url-status=live }}</ref>

<ref name="TA-20170717">{{cite web |last=Koren |first=Marina |title=The Strange Radio Signals Coming From a Nearby Star - Astronomers have detected a mystery transmission at a frequency they haven’t observed before. |url=https://www.theatlantic.com/science/archive/2017/07/the-strange-radio-signals-coming-from-a-nearby-star-ross-128/533907/ |date=July 17, 2017 |work=The Atlantic |accessdate=July 17, 2017 |archive-url=https://web.archive.org/web/20170718165825/https://www.theatlantic.com/science/archive/2017/07/the-strange-radio-signals-coming-from-a-nearby-star-ross-128/533907/ |archive-date=18 जुलाई 2017 |url-status=live }}</ref>

<ref name=eso>{{cite web|title=Closest Temperate World Orbiting Quiet Star Discovered - ESO’s HARPS instrument finds Earth-mass exoplanet around Ross 128|url=https://www.eso.org/public/news/eso1736/|website=www.eso.org|accessdate=15 November 2017|archive-url=https://web.archive.org/web/20171115164511/http://www.eso.org/public/news/eso1736/|archive-date=15 नवंबर 2017|url-status=dead}}</ref>

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<ref name="4-planet">{{cite journal | last1=Bonfils | first1=Xavier | title=A temperate exo-Earth around a quiet M dwarf at 3.4 parsecs | journal=Astronomy and Astrophysics|  date=2017 | arxiv = 1711.06177 | doi = 10.1051/0004-6361/201731973 | bibcode=2018A&A...613A..25B }}</ref>

<ref name="Mannetal2015">{{cite journal | display-authors=1 | last1=Mann | first1=Andrew W. | last2=Feiden | first2=Gregory A. | last3=Gaidos | first3=Eric | last4=Boyajian | first4=Tabetha | last5=von Braun | first5=Kaspar | title=How to Constrain Your M Dwarf: Measuring Effective Temperature, Bolometric Luminosity, Mass, and Radius | journal=The Astrophysical Journal | volume=804 | issue=1 | pages=38 |date=May 2015 | doi=10.1088/0004-637X/804/1/64 | bibcode=2015ApJ...804...64M |arxiv = 1501.01635 }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ59717087777e&-out.add=.&-source=J/ApJ/804/64/stars&recno=93 Vizier catalogue entry] {{Webarchive|url=https://web.archive.org/web/20171116074648/http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ59717087777e&-out.add=.&-source=J%2FApJ%2F804%2F64%2Fstars&recno=93 |date=16 नवंबर 2017 }}</ref>

<ref name=gaiadr1>{{Cite journal|title=The GALAH Survey: Observational Overview and Gaia DR1 companion|journal=Monthly Notices of the Royal Astronomical Society|volume=465|issue=3|pages=3203|arxiv=1609.02822|author1=Martell|first1=Sarah|display-authors=etal|year=2016|doi=10.1093/mnras/stw2835|bibcode = 2017MNRAS.465.3203M }}</ref>

<ref name="APJ">{{cite journal|last1=Mann|first1=Andrew W.|last2=Feiden|first2=Gregory A.|last3=Gaidos|first3=Eric|last4=Boyajian|first4=Tabetha|last5=Braun|first5=Kaspar von|title=HOW TO CONSTRAIN YOUR M DWARF: MEASURING EFFECTIVE TEMPERATURE, BOLOMETRIC LUMINOSITY, MASS, AND RADIUS|journal=The Astrophysical Journal|date=4 May 2015|volume=804|issue=1|pages=64|doi=10.1088/0004-637X/804/1/64|url=https://www.aanda.org/articles/aa/pdf/forth/aa31973-17.pdf|accessdate=15 November 2017|bibcode=2015ApJ...804...64M|arxiv=1501.01635|archive-url=https://web.archive.org/web/20171116030410/https://www.aanda.org/articles/aa/pdf/forth/aa31973-17.pdf|archive-date=16 नवंबर 2017|url-status=live}}</ref>

}}

[[श्रेणी:कन्या तारामंडल]]
[[श्रेणी:ऍम-प्रकार मुख्य-अनुक्रम तारे]]