Constellation search from April 22 2007 received three good answers before it was correctly closed as duplicate to our canonical Where can I find the positions of the planets, stars, moons, artificial satellites, etc. and visualize them? which was cultivated and cared-for by the late @user21.
Two of the three answers there are not found in the canonical answer (in-the-sky.org, skyandtelescope.org); we might not have found that out had that question been closed earlier, the Sky and Telescope answer was added only 40 minutes before the insta-close.
Closing as duplicate is a very important tool as it directs future readers to answers they should see, I'm just asking about the speed.
The Sky and Telescope answer is the first post from a new answer, the only up vote the've received is mine, and only because I stopped by to check on the question. Had the question been given another day or two before closing, perhaps by letting the community do it, they might have picked up another vote or two.
New users are a low question rate SE site's life blood. They are to be encouraged and nurtured.
- had closing been only ~40 minutes earlier we would have lost a valuable answer not found in the duplicate
- had closing been a day or two later, a new user may have received some precious first up votes for that new and valuable answer.
- Even if they go and add it to the community wiki of the duplicate, they can't receive up votes, and would be discouraged from posting a separate answer where they could.
Question: Is insta-closing of potential duplicates always the best way? In low Q-rate sites? Is there something to be said for slow-closing or eventual closing?