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Table 1
ϕ Dra photometry used for the improvement of the ephemeris (see Eq. (3)).
| Years | Type | N | O–Cnew | Source |
|
|
||||
| 1974–5 | 10 col. | 375 | 0 00095(55) |
Musielok et al. (1980) |
| 1991–2 | Hp | 104 | −0005(9) |
ESA (1997) |
| 2013 | BVRI | 194 | 0006(14) |
this paper |
Notes. N denotes the number of measurements and O–Cnew are O–C values derived using the ephemeris based on Eq. (3).
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