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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 523 records

# Target Observer Julian Date UTC Date Magnitude Uncertainty Band Type
1 HL Tau HBB 2458421.9124 2018-10-30 09:53 14.618 0.020 Johnson V CCD
2 HL Tau DEY 2458421.6200 2018-10-30 02:52 14.675 0.007 Johnson V CCD
3 HL Tau DEY 2458421.6280 2018-10-30 03:04 15.924 0.028 Johnson B CCD
4 HL Tau YBA 2458422.1660 2018-10-30 15:58 15.702 0.242 Johnson B CCD
5 HL Tau YBA 2458422.1720 2018-10-30 16:07 14.634 0.054 Johnson V CCD
6 HL Tau YBA 2458422.1736 2018-10-30 16:09 13.543 0.057 Cousins R CCD
7 HL Tau YBA 2458422.1752 2018-10-30 16:12 12.560 0.111 Cousins I CCD
8 HL Tau SDM 2458422.6042 2018-10-31 02:30 15.948 0.059 Johnson B CCD
9 HL Tau SDM 2458422.6000 2018-10-31 02:23 14.624 0.047 Johnson V CCD
10 HL Tau DEY 2458422.6210 2018-10-31 02:54 14.667 0.007 Johnson V CCD
11 HL Tau DEY 2458422.6260 2018-10-31 03:01 15.931 0.020 Johnson B CCD
12 HL Tau HBB 2458423.8838 2018-11-01 09:12 14.627 0.009 Johnson V CCD
13 HL Tau DEY 2458423.6212 2018-11-01 02:54 14.557 0.060 Johnson V CCD
14 HL Tau VMT 2458424.4106 2018-11-01 21:51 15.862 0.126 Johnson B CCD
15 HL Tau VMT 2458424.4115 2018-11-01 21:52 16.088 0.147 Johnson B CCD
16 HL Tau VMT 2458423.5004 2018-11-01 00:00 14.598 0.166 Johnson V CCD
17 HL Tau KWIA 2458424.7541 2018-11-02 06:05 14.605 0.048 Johnson V CCD
18 HL Tau VMT 2458425.4095 2018-11-02 21:49 14.559 0.073 Johnson V CCD
19 HL Tau VMT 2458425.4107 2018-11-02 21:51 14.660 0.073 Johnson V CCD
20 HL Tau VMT 2458425.4117 2018-11-02 21:52 15.960 0.094 Johnson B CCD
21 HL Tau VMT 2458425.4126 2018-11-02 21:54 15.788 0.094 Johnson B CCD
22 HL Tau VMT 2458426.4318 2018-11-03 22:21 14.727 0.116 Johnson V CCD
23 HL Tau VMT 2458426.4339 2018-11-03 22:24 15.939 0.092 Johnson B CCD
24 HL Tau VMT 2458426.4347 2018-11-03 22:25 16.020 0.100 Johnson B CCD
25 HL Tau SDM 2458426.5986 2018-11-04 02:21 15.855 0.058 Johnson B CCD