Data Release 1: schema

Table Schema for questdr1 in QuestProducts:

objid (bigint)

bundleid (bigint)

x (float)

y (float)

ra (float)

dec (float)

epoch (datetime)

mag (float)

magerr (float)

filter (ntext)

type (int)

htmid (bigint)

• objid is unique for each detection (described below)
• bundleid consists of 2-4 near-concurrent detections in different filters (same scan)
• x and y are positions on CCD (0 < x < 2400; 0 < y < 600)
• epoch is the epoch corresponding to the frame (epochs for individual objects are off by upto 150 seconds based on x).
• mag is the calibrated magnitude and magerr the corresponding error
• filter is one of JB, JR, JI, gg, gr, gi, or gz (Johnson B, R, I; Gunn g, r, i, z)
• type indicates if it is a star or a galaxy. Presently its from SDSS, but we have our own multi-pass methods and their output will be updated soon.
• htmid is the HTM index

objid schema:

Attribute	Example	In Name	Position	Value range (description)
Date	20060701	60701	1-5	(30000-91231) (drop first 200)
Scan	010	010	6-8	(001-999)
Row	A	1	9	(1-4) (A,B,C,D)
Filterset	z2 (Gunn)	2	10	(1-3) (Johnson, Gunn, New Gunn)
Column	01	01	11-12	(01-28)
Frame	010	010	13-15	(001-999)
Detection	1	0001	16-19	(0001-9999 per frame)

Object ID: 6070101012010100001

Filter combinations:
Johnson (A=JR, B=JI, C=JB)
Gunn (A=z2, B=z1, C=gi, D=gr)
New Gunn (A=gg, B=z3, C=gi, D=gr)