Talk:RX J0852.0−4622

Re: Japan[edit]

Okay well evidence and reference now indicates the event was witnessed on earth south Hemi in 1271ad, in Japan but then if it is actually 800 ly away, the actual event happened in 471 ad....and took 800 years to reach earth at light speed . And so the full shock wave has past earth already and we are thus seeing perhaps shadows or echoes of it travelling slower than full light speed. Cheers — Preceding unsigned comment added by Swanny (talk • contribs) 11:22, 3 October 2022 (UTC)[reply]

I removed the whole thing after discussion here. Viriditas (talk) 22:40, 7 December 2023 (UTC)[reply]

tag[edit]

How long does the wikify tag have to stay on? It is a short article. The references say an awful lot about this supernova remnant, but the most important facts are that it is the closest, it is invisible, and no notes of it remain. I don't think the article needs to be any bigger or more referenced. I think it is time to remove the wikify tag. --67.81.119.3 03:16, 7 August 2007 (UTC)--Marcwiki9 15:41, 7 August 2007 (UTC)[reply]

Supernova time[edit]

Original version said that the supernova was 700 years ago and 700 light years away; I tried to clarify this a bit to say it occurred 1400 years ago and would have been seen 700 years ago. Also, I change the distance to 650-700 light years, since the references give both figures. Geoffrey.landis 20:14, 8 August 2007 (UTC)[reply]

Visibility[edit]

"If the remnant is indeed young and nearby, its corresponding supernova should have been visible from the Earth in about the year 1250. One difficulty with this interpretation is that there are no contemporary written reports of any supernova at that time or in that part of the sky."

Since the constellation Vela is in the southern sky, would it even have been visible in Europe and China? AndroidCat (talk) 04:18, 13 September 2011 (UTC)[reply]

Look at the declination. For simple geometric reasons it wouldn't have been visible north of -46° 22' + 90° = 43° 38' (actually the limit is about 1° farther north due to atmospheric refraction), so it would have been visible in southern Europe. Icek (talk) 21:55, 18 October 2011 (UTC)[reply]

Thanks. So it should have definitely been visible to the active Muslim astronomers of the time. That is a puzzle. AndroidCat (talk) 23:26, 1 February 2012 (UTC)[reply]

Depending on season, it may have been only visible during the day: At 30° north latitude it's only visible for somewhat less than 6 hours per day (fraction of the day that an object is visible from the opposite hemisphere = arccos(sin(observer latitude)/cos(object declination))/π). If it was at 700 light years distance and of the same brightness as SN 1987A, it should have had an apparent magnitude of -9. Maybe one can miss such an object in the southern day sky? Icek (talk) 13:11, 22 March 2012 (UTC)[reply]

SN 1006, SN 1054 and SN 1572 seem to have lasted for roughly two years as observable events, so at some point RX J0852.0-4622 should have visible in the southern night sky. AndroidCat (talk) 05:44, 31 March 2012 (UTC)[reply]

Galactic Coordinates[edit]

Think the "Galactic Longitude" is 266 (not 286) — Preceding unsigned comment added by 49.49.247.90 (talk) 12:06, 8 October 2017 (UTC)[reply]

Little Ice Age[edit]

Possible contributor to the Little Ice Age ? Similar to the Younger Dryas#Vela supernova hypothesis.

Vela jr[edit]

Well if this vela jr micro nova ? Remenant is 800 Ly away and exploded 800 years ago...??? Then it wouldnt be visible to earth, till around now...1320 ad +800 years 2120 ,ad Much as a telescope sees an approaching asteroid. The Hubble telescope captured the approaching shock wave that follows the light , in 2004. Not sure how far away the wave was ?????? Swanny. Ed cam Canada Amateur astronomer. 207.167.28.222 (talk) 02:41, 26 April 2022 (UTC)[reply]

Vela jr contradiction[edit]

Well reports I've read that the data is contradictory, and the vela jr remenant and the vela Jr claw are some how incompatible or inconsistent.. although new info on micro novas might add some missing pieces? 68.148.80.176 (talk) 12:06, 26 April 2022 (UTC)[reply]

Okay well evidence and reference now indicates the event was witnessed on earth south Hemi in 1271ad, but then if it is actually 800 ly away, the actual event happened in 471 ad....and took 800 years to reach earth at light speed . And so the full shock wave has past earth already and we are thus seeing perhaps shadows or echoes of it travelling slower. than full light speed. Swanny (talk) 11:23, 3 October 2022 (UTC)[reply]