Contents.
      planet: 7 - Uranus  
  satellites: U1-Ariel  :  8,
              U2-Umbriel:  5
total number: 13
        type: relative
       dates: 1887-1887
 observatory: 020 - Nice
             
Reference.
   Perrotin M. (1887)
   Observations des satellites Hyperion, Ariel, Umbriel et
   du satellite de Neptune faites a l'observatoire de Nice.
   Bulletin Astronomique. V. 4. P. 339-340. 
   1887BuAsI___4__339P

Informations.
         relative to: Uranus
     reference frame: apparent
     centre of frame: topocentre
    epoch of equinox: date
          time scale: Nice Mean Time
           reduction: no information
         coordinates: position angle and separation
    diff. refraction: no information
            receptor: micrometric
           telescope: equatorial, D= 0.76 m
           observers: Perrotin M.
 data included in standard data file: no

Comments.
          no information

Format.
  1. Observed satellite number, obs.
  2. Year    of the moment of observation
  3. Month   of the moment of observation
  4. Day     of the moment of observation 
  5. Hour    of the observation of P (99 if P is not given)
  6. Minute  of the observation of P (99 if P is not given)
  7. Seconde of the observation of P (99 if P is not given)
  8. P (position angle) in degrees (999.9 if P is not given)
  9. Hour    of the observation of S
 10. Minute  of the observation of S
 11. Seconde of the observation of S
 12. S (separation) in arcsec

------------------------------------------------
   Year         N.M.T.             N.M.T.
     month      h  m  s   P       h  m  s    S
sat       day           degrees           arcsec
------------------------------------------------