1
00:00:00,020 --> 00:00:04,040
[Sound Effects]

2
00:00:04,060 --> 00:00:08,080
[Sound Effects]

3
00:00:08,100 --> 00:00:12,090
Here are a few things you might like to know about the images you see in

4
00:00:12,110 --> 00:00:16,120
Disk Detective. The red crosshairs are 2.1

5
00:00:16,140 --> 00:00:20,160
arcseconds across. The red circle is 

6
00:00:20,180 --> 00:00:24,200
10.5 arcseconds in radius. The whole Disk Detective

7
00:00:24,220 --> 00:00:28,210
image is 60 arcseconds across. An 

8
00:00:28,230 --> 00:00:32,260
arcsecond is about the size of a dime seen from a mile away.

9
00:00:32,280 --> 00:00:36,280
For example: the angular diameter of the planet Neptune as

10
00:00:36,300 --> 00:00:40,300
seen from Earth is about 150 arcseconds.

11
00:00:40,320 --> 00:00:44,330
In these images, the bright objects appear white

12
00:00:44,350 --> 00:00:48,380
or light blue. The empty sky around them

13
00:00:48,400 --> 00:00:52,420
appears black or a mottled black-and-blue pattern.

14
00:00:52,440 --> 00:00:56,440
That mottling is noise. You'll want to focus your

15
00:00:56,460 --> 00:01:00,470
attention on the white and light-blue areas. At

16
00:01:00,490 --> 00:01:04,490
Disk Detective, we find new disks by looking at the object

17
00:01:04,510 --> 00:01:08,540
in images taken with several different telescopes. The images are

18
00:01:08,560 --> 00:01:12,610
arranged in a flip book, which you can play by clicking on the play button on the lower left.

19
00:01:12,630 --> 00:01:16,620
A good candidate is small and round

20
00:01:16,640 --> 00:01:20,640
and mostly contained within the red circle--like this object.

21
00:01:20,660 --> 00:01:24,690
Sometimes bright objects, like this one on the left,

22
00:01:24,710 --> 00:01:28,710
can have diffraction spikes that stick out beyond the red circle. These can

23
00:01:28,730 --> 00:01:32,720
also be good candidates. We're not as interested in objects that are

24
00:01:32,740 --> 00:01:36,740
outside the red circle, but if you like you can click on

25
00:01:36,760 --> 00:01:40,750
the icon in the upper right and discuss them on talk.

26
00:01:40,770 --> 00:01:44,810
Here on the talk page, you can see the image ID

27
00:01:44,830 --> 00:01:48,830
in the upper-left-hand corner. You can also click on the 

28
00:01:48,850 --> 00:01:52,880
collect button to favorite your image, to start a collection of your 

29
00:01:52,900 --> 00:01:56,900
favorite images. You can type your own comments

30
00:01:56,920 --> 00:02:00,960
into the blue box, and you can read comments that

31
00:02:00,980 --> 00:02:04,980
other people have written. SED stands

32
00:02:05,000 --> 00:02:09,040
for Spectral Energy Distribution. That's a plot

33
00:02:09,060 --> 00:02:13,060
of how bright this object is in each of the infrared wavelengths

34
00:02:13,080 --> 00:02:17,100
that you saw in the flip book. Looking at SEDs 

35
00:02:17,120 --> 00:02:21,140
can help us figure out whether the object is really a star with a disk

36
00:02:21,160 --> 00:02:25,160
or whether it's some other kind object, maybe a galaxy.

37
00:02:25,180 --> 00:02:29,220
Click on the "More info in SIMBAD" button to access a powerful

38
00:02:29,240 --> 00:02:33,250
database of astronomical objects. This

39
00:02:33,270 --> 00:02:37,280
line in SIMBAD tells you the angular distance in arcseconds

40
00:02:37,300 --> 00:02:41,330
between the Disk Detective object and this SIMBAD object

41
00:02:41,350 --> 00:02:45,350
to help you make sure you are looking at the right thing. SIMBAD is a great

42
00:02:45,370 --> 00:02:49,380
resource, but doesn't have information on every Disk Detective 

43
00:02:49,400 --> 00:02:53,410
object. Also, SIMBAD is sometimes wrong, so don't

44
00:02:53,430 --> 00:02:57,440
discount an object just because SIMBAD has labeled it as a quasar,

45
00:02:57,460 --> 00:03:01,470
like this one. If you use a

46
00:03:01,490 --> 00:03:05,530
hashtag in your comments, people will be able to find your comments easily

47
00:03:05,550 --> 00:03:09,570
by searching for that hashtag. After you've watched the flip book

48
00:03:09,590 --> 00:03:13,600
at least once, you can select the classification of this object

49
00:03:13,620 --> 00:03:17,630
by clicking on the rectangles. This looks like a good candidate

50
00:03:17,650 --> 00:03:21,660
since it looks round, and fairly concentrated, so I'll click "None

51
00:03:21,680 --> 00:03:25,700
of the Above/Good Candidate" Then I'll click on the

52
00:03:25,720 --> 00:03:29,730
"Finish" button to record my classification.

53
00:03:29,750 --> 00:03:33,780
If you've gotten this far, congratulations, you've just classified

54
00:03:33,800 --> 00:03:37,810
an object. Thank you for helping NASA find new planetary

55
00:03:37,830 --> 00:03:41,850
systems.

56
00:03:41,870 --> 00:03:45,900


57
00:03:45,920 --> 00:03:49,930
[Beeping]

58
00:03:49,950 --> 00:03:58,352
[Beeping]