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This work presents the catalogue of optical spectral properties for all X-rayselected SPIDERS active galactic nuclei (AGN) up to SDSS DR14. SPIDERS(SPectroscopic IDentification of eROSITA Sources) is an SDSS-IV programme thatis currently conducting optical spectroscopy of the counterparts to the X-rayselected sources detected in the ROSAT all-sky survey and the XMM-Newton slewsurvey in the footprint of the Extended Baryon Oscillation Spectroscopic Survey(eBOSS). The SPIDERS DR14 sample is the largest sample of X-ray selected AGNwith optical spectroscopic follow-up to date. The catalogue presented here isbased on a clean sample of 7344 2RXS ($\rm \bar{z}$ = 0.5) and 1157 XMM-Newtonslew survey ($\rm \bar{z}$ = 0.4) type 1 AGN with spectroscopic coverage of theH$\rm \beta$ and/or MgII emission lines. Visual inspection results for eachobject in this sample are available from a combination of literature sourcesand the SPIDERS group, which provide both reliable redshifts and sourceclassifications. The spectral regions around the H$\rm \beta$ and MgII emissionlines have been fit in order to measure both line and continuum properties,estimate bolometric luminosities, and provide black hole mass estimates usingthe single-epoch (or photoionisation) method. The use of both H$\rm \beta$ andMgII allows black hole masses to be estimated up to z $\rm \simeq$ 2.5. Acomparison is made between the spectral properties and black hole massestimates derived from H$\rm \beta$ and MgII using the subsample of objectswhich have coverage of both lines in their spectrum. These results have beenmade publicly available as an SDSS-IV DR14 value added catalogue.

SDSS-IV/SPIDERS: A Catalogue of X-Ray Selected AGN Properties; Spectral Properties and Black Hole Mass Estimates for SPIDERS SDSS DR14 Type 1 AGN