Contents.
      planet: 7 - Uranus  
  satellites: U1-Ariel   :  7
              U2-Umbriel :  3,
              U3-Titania :  1,
              U4-Oberon  :  see reference satellites
              U5-Miranda : 12,
total number: 23
        type: relative
       dates: 2015-2018
 observatory: 874 - Observatorio do Pico dos Dias, Itajuba

References.
   Santos-Filho S., Assafin M., Morgado B. E.,
   Vieira-Martins R., Camargo J. I. B., Gomes-Junior A. R., Benedetti-Rossi G.
   Mutual approximations between the five main moons of Uranus.
   Monthly Notices of the Royal Astronomical Society. 2019. V. 490. Issue 3. P. 3464-3475. 
   2019MNRAS_490_3464S

Informations.
         relative to: reference satellite: 
                      U1-Ariel   :  4, 
                      U2-Umbriel :  4, 
                      U3-Titania : 11,
                      U4-Titania :  4,
                      U5-Miranda :  0
     reference frame: astrometric
     centre of frame: topocentre
    epoch of equinox: J2000
          time scale: UTC 
           reduction: no information
         coordinates: X, Y. diatance, moments of mutual approximation
    diff. refraction: no information
            receptor: CCD
           telescope: 1.6 m
           observers: see reference
 data included in standard data file: no

Comments.
          no information

Format.
  1. Year of the Central Instant of Mutual approximation
  2. Month of the Central Instant of Mutual approximation
  3. Day of the Central Instant of Mutual approximation
  4. Hour of the Central Instant of Mutual approximation (UTC)
  5. Minute of the Central Instant of Mutual approximation (UTC)
  6. Seconds of the Central Instant of Mutual approximation (UTC)
  7. S1, number of the subject satellite in the pair
  8. S2, number of the reference satellite in the pair
  9. sig t0, the central instant error in seconds of time
 10. Delta t0, the central instant difference with the ephemeris in seconds of time
 11. V sig t0, converted from seconds of time (t0) to mas (t0*v0) by using the ephemeris relative velocity, mas
 12. V Delta t0, the central instant difference with the ephemeris, 
               converted from seconds of time (t0) to mas (t0*v0) by using the ephemeris relative velocity, mas
 13. d0, Relative apparent distance between the satellites in pair, mas
 14. sig d0, the relative apparent distance error, mas
 15. Delta d0, the relative apparent distance difference with the ephemeris, mas
 16. X, the astrometric topocentric inter-satellite (cos(delta) applied) in the sense Sat 1 minus Sat 2, mas
 17. Y, the astrometric topocentric inter-satellite in the sense Sat 1 minus Sat 2, mas
 18. sig X, the relative astrometric X coordinate error, mas
 19. sig Y, the relative astrometric Y coordinate error, mas
 20. Delta X, the relative astrometric X coordinate difference with the ephemeris, mas
 21. Delta Y, the relative astrometric Y coordinate difference with the ephemeris, mas

---------------------------------------------------------------------------------------------------------------------------------
year
  nonth                 S1 S2  sig   Delta    V        V       d0     sig   Delta      X          Y     sig   sig   Delta   Delta
       day   h  m  s            t0      t0  sig t0 Delta t0   (mas)    d0     d0      (mas)     (mas)    X     Y      X       Y
---------------------------------------------------------------------------------------------------------------------------------