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The AAVSO International Database is a repository of variable star observations contributed by amateur and professional astronomers worldwide. Use the form below to search for observations of specific stars or by specific observers.

Enter list of star names, comma separated.
Enter a date in natural language, jd, or utc format.
Enter a date in natural language, jd, or utc format.
Separate multiple observers with commas.
Campaign overrides targets and dates.

Found 551 records

# Target Observer Julian Date UTC Date Magnitude Uncertainty Band Type
1 HL Tau DFS 2459079.6800 2020-08-18 04:19 15.092 0.025 Johnson V CCD
2 HL Tau DFS 2459079.6812 2020-08-18 04:20 14.121 0.016 Cousins R CCD
3 HL Tau DFS 2459080.6786 2020-08-19 04:17 14.963 0.021 Johnson V CCD
4 HL Tau DFS 2459080.6798 2020-08-19 04:18 13.975 0.015 Cousins R CCD
5 HL Tau KSLA 2459079.6344 2020-08-18 03:13 15.05 0.005 Johnson V CCD
6 HL Tau CFJB 2459080.6853 2020-08-19 04:26 14.8197 0.0127 Unfiltered with V Zeropoint CCD
7 HL Tau CFJB 2459080.6995 2020-08-19 04:47 13.9026 0.0153 Cousins R CCD
8 HL Tau CFJB 2459080.6936 2020-08-19 04:38 14.9195 0.0193 Johnson V CCD
9 HL Tau DFS 2459081.6782 2020-08-20 04:16 14.896 0.034 Johnson V CCD
10 HL Tau DFS 2459081.6795 2020-08-20 04:18 13.946 0.048 Cousins R CCD
11 HL Tau WGR 2459081.9929 2020-08-20 11:49 14.7532 0.0335 Johnson V CCD
12 HL Tau WGR 2459081.9944 2020-08-20 11:51 14.6342 0.0278 Johnson V CCD
13 HL Tau WGR 2459081.9958 2020-08-20 11:54 14.6896 0.0279 Johnson V CCD
14 HL Tau WGR 2459081.9973 2020-08-20 11:56 14.6443 0.0283 Johnson V CCD
15 HL Tau WGR 2459081.9988 2020-08-20 11:58 14.6555 0.0268 Johnson V CCD
16 HL Tau WGR 2459082.0003 2020-08-20 12:00 14.5810 0.0246 Johnson V CCD
17 HL Tau WGR 2459082.0021 2020-08-20 12:03 12.8426 0.0061 Cousins R CCD
18 HL Tau WGR 2459082.0036 2020-08-20 12:05 12.8348 0.0064 Cousins R CCD
19 HL Tau WGR 2459082.0051 2020-08-20 12:07 12.9179 0.0067 Cousins R CCD
20 HL Tau WGR 2459082.0066 2020-08-20 12:09 12.8410 0.0071 Cousins R CCD
21 HL Tau WGR 2459082.0081 2020-08-20 12:11 12.8563 0.0076 Cousins R CCD
22 HL Tau WGR 2459082.0096 2020-08-20 12:13 12.7614 0.0095 Cousins R CCD
23 HL Tau WGR 2459082.9505 2020-08-21 10:48 13.3665 0.0018 Cousins R CCD
24 HL Tau WGR 2459082.9516 2020-08-21 10:50 13.3254 0.0018 Cousins R CCD
25 HL Tau WGR 2459082.9528 2020-08-21 10:52 13.3531 0.0018 Cousins R CCD