J/ApJS/269/53ivo://CDS.VizieR/J/ApJS/269/53CDSErmolli I.Chatzistergos T.Giorgi F.Carrasco V.M.S.Aparicio A.J.P.,Chinnici I.2024-11-28T16:24:11Z2024-03-19T13:17:31ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frthe-sunAngelo Secchi, an Italian Jesuit and prominent scientist of the 19th century, and one of the founders of modern astrophysics, observed the Sun regularly at the Collegio Romano in Rome, Italy, for more than 25yr. Results from his observations are reported in articles published in the scientific journals of the time, as well as in drawings and personal notebooks that are stored in the historical archive of the Istituto Nazionale di Astrofisica Osservatorio Astronomico di Roma. The latter material, which reports solar observations performed from 1853-1878, includes original documents from Secchi and from a few of his close collaborators. The above unique material has recently been digitized for preservation purposes and for allowing the scientific exploitation of data not easily accessible so far. A total of more than 5400 digital images have been produced. Here we present the archival material and the new digital data derived from it. We also present results obtained from our primary analysis of the new digital data. In particular, we produced new measurements of the group number from 1853-1878, which will be available for future recalibration of the group number series.2023ApJS..269...53Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/269/53CatalogResearchIsServedByTAP VizieR generic servicerelated-toVI/138 : Sunspots catalogues, 1853-1870 (Casas+, 2013)J/A+A/390/707 : Hemispheric Sunspot Numbers 1975-2000 (Temmer+, 2002)J/A+A/447/735 : Hemispheric Sunspot Numbers 1945-2004 (Temmer+, 2006)J/A+A/595/A104 : Scheiner drawing sunspot areas and tilt angles (Arlt+, 2016)J/A+A/602/A69 : Group sunspot number series since 1739 (Chatzistergos+, 2017)J/A+A/601/A106 : Sunspot on 1921-2011 (Mandal+, 2017)J/A+A/601/A109 : Monthly numbers of sunspot groups 1749-1996 (Willamo+, 2017)J/A+A/615/A93 : Reconstructed decadal sunspot numbers (Wu+, 2018)J/A+A/639/A88 : Plage area composite series (Chatzistergos+, 2020)J/A+A/640/A78 : Sunspot area catalogue revisited (1874-2019) (Mandal+, 2020)J/A+A/640/A17 : CR Ground Level Enhancements spectra (IGLED) (Usoskin+, 2020)J/A+A/649/A141 : 1000-year sunspot series (Usoskin+, 2021)J/A+A/652/A56 : Hemispheric Sunspot Numbers 1874-2020 (Veronig+, 2021)J/other/FrASS/9.1019751 : Sunspot on 1904-2017 (Jha+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/269/53https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/269/53http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/269/53https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/269/53https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/269/53http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/269/53GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/ApJS/269/53/table1Daily values of group sunspot numbers from our studyFlagFlag (1)meta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsObservation date (UT)time.epoch;obscharDate[1853.5/1879] Date of observation; fractional yearyrtime.epochdoubleJD[2398046/2407349.9] Julian Date of the observationdtime.epochdoubleGN[0/18] Group numbermeta.idint