<p>There is the unusual white dwarf <a href="http://www.aanda.org/articles/aa/abs/2015/12/aa27261-15/aa27261-15.html" rel="nofollow">RX J0439.8−6809</a>.  It seems to be a carbon-oxygen white dwarf with a temperature of around 250,000 K!  It is 9200 pc away.  You might want to look for other PG 1159 stars to see how far they can be detected.</p>

CC BY-SA 3.0
2016-07-11T09:37:52.467Z
Thats a seriously hot star! I didn't know White Dwarfs could even get that hot, might explain why it was discovered so far away tho!
Dean
CC BY-SA 3.0
2016-07-11T13:58:39.520Z
It follows that the most distant white dwarfs detectable will be the youngest and hottest.
ProfRob
CC BY-SA 3.0
2016-07-11T19:12:11.773Z
Actually it's so hot it emits soft X-rays which makes it easier to observe.
AlaskaRon
CC BY-SA 3.0
2016-07-11T07:11:13.440Z
2016-07-11T07:11:13.440Z
AlaskaRon
<p>Based on a Simbad search, it looks like the most distant white dwarf is WD J0106-0014, which was measured in <a href="http://adsabs.harvard.edu/abs/2011ApJS..197...38D" rel="nofollow">Debes et al. 2011</a> to be at 6442 pc.  Here's the Simbad page:</p>

<p><a href="http://simbad.u-strasbg.fr/simbad/sim-id?mescat.distance=on&amp;Ident=%401372027&amp;Name=WD+J0106-0014&amp;submit=display+selected+measurements#lab_meas" rel="nofollow">http://simbad.u-strasbg.fr/simbad/sim-id?mescat.distance=on&amp;Ident=%401372027&amp;Name=WD+J0106-0014&amp;submit=display+selected+measurements#lab_meas</a></p>

CC BY-SA 3.0
2016-07-07T19:17:18.480Z
Wow thats pretty far, over 3/4 the distance to the center of the galaxy!
Dean
CC BY-SA 3.0
2016-07-07T16:54:09.093Z
2016-07-07T16:54:09.093Z
J. O'Brien Antognini
<p>I attended a talk last week about Type 1a supernovae with the focus being on double-degenerate systems as potential progenitors for them. We were shown a graph of White Dwarf (WD) mass distribution like the one below (<a href="http://inspirehep.net/record/1184318/plots" rel="nofollow noreferrer">source</a>), and it got me thinking, because even though they are very faint objects they are also very numerous in our galaxy. 
So this led me to wonder what is the furthest known WD from Earth given that they are so faint but so numerous. I have looked for an answer online but the closest I got was a Type 1a progenitor at redshift 2 called "SN UDS10Wil" but this is not what I am looking for because this is not observable from Earth, it is just inferred from the supernova classification.</p>

<p><a href="https://i.sstatic.net/6LnnU.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/6LnnU.png" alt="enter image description here"></a></p>

<white-dwarf>
What is the most distant observable White Dwarf known?
Dean
# What is the most distant observable White Dwarf known?

(Asked by: username_0 on 2016-07-05)

I attended a talk last week about Type 1a supernovae with the focus being on double-degenerate systems as potential progenitors for them. We were shown a graph of White Dwarf (WD) mass distribution like the one below ([source](http://inspirehep.net/record/1184318/plots)), and it got me thinking, because even though they are very faint objects they are also very numerous in our galaxy.
So this led me to wonder what is the furthest known WD from Earth given that they are so faint but so numerous. I have looked for an answer online but the closest I got was a Type 1a progenitor at redshift 2 called "SN UDS10Wil" but this is not what I am looking for because this is not observable from Earth, it is just inferred from the supernova classification.

[![enter image description here](https://i.sstatic.net/6LnnU.png)](https://i.sstatic.net/6LnnU.png)

**Tags:** white-dwarf

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## 2 answers

### Answer by username_1 on 2016-07-11. Score: 3

There is the unusual white dwarf [RX J0439.8−6809](http://www.aanda.org/articles/aa/abs/2015/12/aa27261-15/aa27261-15.html). It seems to be a carbon-oxygen white dwarf with a temperature of around 250,000 K! It is 9200 pc away. You might want to look for other PG 1159 stars to see how far they can be detected.

> **Comments:**
> **username_0**: Thats a seriously hot star! I didn't know White Dwarfs could even get that hot, might explain why it was discovered so far away tho!  
> **username_2**: It follows that the most distant white dwarfs detectable will be the youngest and hottest.  
> **username_1**: Actually it's so hot it emits soft X-rays which makes it easier to observe.  

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### Answer by username_3 on 2016-07-07. Score: 2

Based on a Simbad search, it looks like the most distant white dwarf is WD J0106-0014, which was measured in [Debes et al. 2011](http://adsabs.harvard.edu/abs/2011ApJS..197...38D) to be at 6442 pc. Here's the Simbad page:

<http://simbad.u-strasbg.fr/simbad/sim-id?mescat.distance=on&Ident=%401372027&Name=WD+J0106-0014&submit=display+selected+measurements#lab_meas>

> **Comments:**
> **username_0**: Wow thats pretty far, over 3/4 the distance to the center of the galaxy!  

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