Table 1
Characteristics of the OBs used in UltraVISTA season 1.
| OB description | Filter | DIT [s] | NDIT | Jitter parameters | Nesting | Npawprints | Total exp. [s] | NOBs | ||
| Pattern | Amplitude [′′] | Njit | ||||||||
|
|
||||||||||
| Y | Y | 30 | 4 | Random | 60 | 30 | FPJME | 1 | 3600 | 36 |
| J | J | 30 | 4 | Random | 60 | 30 | FPJME | 1 | 3600 | 37 |
| H | H | 6 | 10 | Random | 60 | 60 | FPJME | 1 | 3600 | 36 |
| Ks long OB | Ks | 10 | 6 | Random | 60 | 60 | FPJME | 1 | 3600 | 18 |
| Ks short OB | Ks | 10 | 6 | Random | 60 | 30 | FPJME | 1 | 1800 | 27 |
| NB118 single paw | NB118 | 300 | 1 | Random | 61 | 11 | FPJME | 1 | 3300 | 6 |
| NB118 three paws | NB118 | 280 | 1 | Random | 61 | 4 | FJPME | 3 | 3360 | 4 |
Notes. The “Amplitude” column gives the Maximum Jitter Amplitude, where a value of 60′′ corresponds to jitter positions being drawn from a random, uniform distribution over a box of side length 120′′, centered on the nominal centre coordinates of the given pawprint. The “Nesting” column indicates the order in which different operations are done, see text. The “Npawprints” column gives the number of pawprints done by the given OB. To cover the contiguous UltraVISTA field in an approximately uniform manner, a set of 6 OBs of type Npawprints = 1 are needed, each centered on the pawprint in question. The “Total exp.” column gives the total exposure time contained in the OB; this number is DIT × NDIT × Njit × Npawprints. The “NOBs” column gives the number of OBs of the given type that are associated with the data covered by this paper.
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