Column Descriptions for the 2MASS Second Incremental Release Survey Scan Info
| Column # | Column Name | Description | Units | Bytes | Formata | Nulls Allowed |
|---|---|---|---|---|---|---|
| 1 | hemis | hemisphere (N/S) of observation | --- | 6 | 1s | n |
| 2 | date | observation date | --- | 9-14 | 6s | n |
| 3 | scan | scan number (unique within date) | --- | 17-19 | 3s | n |
| 4 | tile_id | tile ID number | --- | 22-27 | 6s | n |
| 5 | ra | right ascension (J2000 decimal deg) of scan center | deg | 30-39 | 10.6f | n |
| 6 | dec | declination (J2000 decimal deg) of scan center | deg | 42-51 | 10.6f | n |
| 7 | glon | galactic longitude (decimal deg) of scan center | deg | 54-63 | 10.6f | n |
| 8 | glat | galactic latitude (decimal deg) of scan center | deg | 66-75 | 10.6f | n |
| 9 | ra_1 | right ascension (J2000 decimal deg) of scan corner 1 | deg | 78-87 | 10.6f | n |
| Notes for ra_1: The four ra_[1234]
and dec_[1234] fields contain the RA and Dec positions of the four corners
of the fully-covered area of the scan (i.e. the area covered by all three
bands). The corners are numbered as follows:
1: eastern corner at scan start 2: western corner at scan start 3: eastern corner at scan end 4: western corner at scan end |
||||||
| 10 | ra_2 | right ascension (J2000 decimal deg) of scan corner 2 | deg | 90-99 | 10.6f | n |
| Notes for ra_2: The four ra_[1234] and
dec_[1234] fields contain the RA and Dec positions of the four corners
of the fully-covered area of the scan (i.e. the area covered by all three
bands). The corners are numbered as follows:
1: eastern corner at scan start 2: western corner at scan start 3: eastern corner at scan end 4: western corner at scan end |
||||||
| 11 | ra_3 | right ascension (J2000 decimal deg) of scan corner 3 | deg | 102-111 | 10.6f | n |
| Notes for ra_3: The four ra_[1234] and
dec_[1234] fields contain the RA and Dec positions of the four corners
of the fully-covered area of the scan (i.e. the area covered by all three
bands). The corners are numbered as follows:
1: eastern corner at scan start 2: western corner at scan start 3: eastern corner at scan end 4: western corner at scan end |
||||||
| 12 | ra_4 | right ascension (J2000 decimal deg) of scan corner 4 | deg | 114-123 | 10.6f | n |
| Notes for ra_4: The four ra_[1234] and
dec_[1234] fields contain the RA and Dec positions of the four corners
of the fully-covered area of the scan (i.e. the area covered by all three
bands). The corners are numbered as follows:
1: eastern corner at scan start 2: western corner at scan start 3: eastern corner at scan end 4: western corner at scan end |
||||||
| 13 | dec_1 | declination (J2000 decimal deg) of corner 1 | deg | 126-135 | 10.6f | n |
| Notes for dec_1: The four ra_[1234] and
dec_[1234] fields contain the RA and Dec positions of the four corners
of the fully-covered area of the scan (i.e. the area covered by all three
bands). The corners are numbered as follows:
1: eastern corner at scan start 2: western corner at scan start 3: eastern corner at scan end 4: western corner at scan end |
||||||
| 14 | dec_2 | declination (J2000 decimal deg) of corner 2 | deg | 138-147 | 10.6f | n |
| Notes for dec_2: The four ra_[1234] and
dec_[1234] fields contain the RA and Dec positions of the four corners
of the fully-covered area of the scan (i.e. the area covered by all three
bands). The corners are numbered as follows:
1: eastern corner at scan start 2: western corner at scan start 3: eastern corner at scan end 4: western corner at scan end |
||||||
| 15 | dec_3 | declination (J2000 decimal deg) of corner 3 | deg | 150-159 | 10.6f | n |
| Notes for dec_3: The four ra_[1234] and
dec_[1234] fields contain the RA and Dec positions of the four corners
of the fully-covered area of the scan (i.e. the area covered by all three
bands). The corners are numbered as follows:
1: eastern corner at scan start 2: western corner at scan start 3: eastern corner at scan end 4: western corner at scan end |
||||||
| 16 | dec_4 | declination (J2000 decimal deg) of corner 4 | deg | 162-171 | 10.6f | n |
| Notes for dec_4: The four ra_[1234] and
dec_[1234] fields contain the RA and Dec positions of the four corners
of the fully-covered area of the scan (i.e. the area covered by all three
bands). The corners are numbered as follows:
1: eastern corner at scan start 2: western corner at scan start 3: eastern corner at scan end 4: western corner at scan end |
||||||
| 17 | quality | quality score for scan (0-10) | --- | 178-179 | 2s | n |
| 18 | ut_beg | beginning UT of scan data | time | 181-188 | 8s | n |
| 19 | julut_beg | Julian date beginning UT of scan data | jdate | 191-200 | 10.5f | n |
| 20 | ut_end | ending UT of scan data | time | 202-209 | 8s | n |
| 21 | julut_end | Julian date ending UT of scan data | jdate | 212-221 | 10.5f | n |
| 22 | j_zp | J band photometric zero-point for scan | mag | 224-230 | 7.4f | n |
| 23 | h_zp | H band photometric zero-point for scan | mag | 233-239 | 7.4f | n |
| 24 | k_zp | K band photometric zero-point for scan | mag | 242-248 | 7.4f | n |
| 25 | j_zperr | J band rms error from zero-point | mag | 252-257 | 6.4f | n |
| 26 | h_zperr | H band rms error from zero-point | mag | 261-266 | 6.4f | n |
| 27 | k_zperr | K band rms error from zero-point | mag | 270-275 | 6.4f | n |
| 28 | j_r1_norm | J band Read1 mag normalization value | mag | 279-285 | 7.4f | n |
| 29 | h_r1_norm | H band Read1 mag normalization value | mag | 289-295 | 7.4f | n |
| 30 | k_r1_norm | K band Read1 mag normalization value | mag | 299-305 | 7.4f | n |
| 31 | j_r1_norm_rms | J band rms of Read1 mag normalization value | mag | 314-319 | 6.4f | n |
| 32 | h_r1_norm_rms | H band rms of Read1 mag normalization value | mag | 328-333 | 6.4f | n |
| 33 | k_r1_norm_rms | K band rms of Read1 mag normalization value | mag | 342-347 | 6.4f | n |
| 34 | j_n_snr10 | No. of J detections in scan with instrumental SNR>10 | --- | 352-357 | 6s | n |
| Notes for j_n_snr10: This fields contains the number of raw point sources detections made in the scan during initial processing that have instrumental magnitudes of J<15.8, H<15.1 or Ks<14.3 at. This source count is a diagnostic measure of the characteristic density of the region, but is not necessarily equal to the number of sources of this brightness that can be found in this scan in the Point Source Catalog. | ||||||
| 35 | h_n_snr10 | No. of H detections in scan with instrumental SNR>10 | --- | 362-367 | 6s | n |
| Notes for h_n_snr10: This fields contains the number of raw point sources detections made in the scan during initial processing that have instrumental magnitudes of J<15.8, H<15.1 or Ks<14.3 at. This source count is a diagnostic measure of the characteristic density of the region, but is not necessarily equal to the number of sources of this brightness that can be found in this scan in the Point Source Catalog. | ||||||
| 36 | k_n_snr10 | No. of K detections in scan with instrumental SNR>10 | --- | 372-377 | 6s | n |
| Notes for k_n_snr10: This fields contains the number of raw point sources detections made in the scan during initial processing that have instrumental magnitudes of J<15.8, H<15.1 or Ks<14.3 at. This source count is a diagnostic measure of the characteristic density of the region, but is not necessarily equal to the number of sources of this brightness that can be found in this scan in the Point Source Catalog. | ||||||
| 37 | n_ext | No. of extended sources detected in scan | --- | 382-384 | 3s | n |
| Notes for n_ext: This fields contains the number of extended source candidates made in the scan during initial processing. This source count is a diagnostic measure of the characteristic density of the region, but is not necessarily equal to the number of sources of this brightness that can be found in this scan in the Extended Source Catalog. | ||||||