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  QX Sge  
000-BFD-594 (No observations)  
Sagitta Sequence
19 59 36.80 +20 48 15.0  (299.90333 +20.80417) Search nearby
B1950.0 19 57 25.06 +20 39 59.5
Galactic coord. 59.197 -4.698
Other names

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PSR B1957+20 PSR J1959+2048  
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Variability type
Spectral type --
Mag. range
20.4 - <23.0 V
Discoverer --
Outburst --
Period --
Rise/eclipse dur. --
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1 Otero, Sebastian Alberto Millisecond pulsar with brown dwarf companion.
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1 Evidence for a Massive Neutron Star from a Radial-velocity Study of the
Companion to the Black-widow Pulsar PSR B1957+20
2 Catalogue of Stellar Spectral Classifications (Skiff, 2009-2016) 1992ApJ...400..638A
3 J.van Paradijs, J.Allington-Smith, P.Callanan, P.A.Charles, B.J.M.Hassall,
G.Machin, K.O.Mason, T.Naylor, A.P.Smale, Nature 334, No.6184,684,1988.
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Revision History
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4 Admin, VSX 2017-12-15 21:13 UTC Spectral type from Skiff (VizieR on-line data: B/mk)
3 Otero, Sebastian Alberto 2011-10-28 05:45 UTC Period from 2011ApJ...728...95V.
2 Admin, VSX 2010-01-04 23:43 UTC Position updated from the GCVS version of November 2009.
1 Admin, VSX 2005-12-17 20:33 UTC Initial upload.