Dictionary of Nomenclature of Celestial Objects
(Last update: 26-Sep-2023)

Result of query: info cati 1M$

Details on Acronym:   1M
  
1M     (Massachusetts univ.)= (MX) = (OS) = (OSO) 
 Write:<<1M  HHMM+DD>>  

        <<1M  HHMM+DDd>>
 N:  138
Object:(X)  (SIMBAD class: X = X-ray Source)
   Ref:=1979ApJS...39..573M
     byMARKERT T.H.
, WINKLER P.F., LAIRD F.N., CLARK G.W., HEARN D.R., SPROTT G.F., LI F.K., BRADT H.V., LEWIN W.H.G., SCHNOPPER H.W.
 Astrophys. J., Suppl. Ser., 39, 573-632 (1979)

    The MIT/OSO 7 catalog of X-ray sources : intensities, spectra and
    long-term variability.
oTable 1: <1M HHMM+DDd>, <1M HHMM+DD>, N=138

Details on Acronym:   MX
  
MX     (Massachusetts univ., X-ray)
  ***** Avoid the usage of MX,  prefer 1M

Details on Acronym:   OS
  
OS     (OSO 7)
  ***** Avoid the usage of OS,  prefer 1M

Details on Acronym:   OSO
  
OSO    (OSO 7)
  ***** Avoid the usage of OSO,  prefer 1M