<p>A <a href="http://vizier.u-strasbg.fr/viz-bin/VizieR" rel="nofollow noreferrer">VizieR query</a> within 15 arcseconds of <a href="https://www.boulder.swri.edu/~buie/occ/MU20180804.html" rel="nofollow noreferrer">Buie's coordinates</a> returns a 13th magnitude star, variously identified as:</p>

<ul>
<li>2MASS <a href="http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ5b6a57cb8ba7&amp;-out.add=.&amp;-source=II/246/out&amp;2MASS===19042146-2035362&amp;-out.orig=o" rel="nofollow noreferrer">19042146-2035362</a></li>
<li>UCAC4 <a href="http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ5b6a57e88eea&amp;-out.add=.&amp;-source=I/322A/out&amp;UCAC4===348-170642&amp;-out.orig=o" rel="nofollow noreferrer">348-170642</a></li>
<li>Gaia DR2 <a href="http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ5b6a4af18782&amp;-out.add=.&amp;-source=I/345/gaia2&amp;-c=286.08948619284%20-20.59347479448,eq=ICRS,rs=0.005&amp;-out.orig=o" rel="nofollow noreferrer">4082342058110504064</a></li>
</ul>

CC BY-SA 4.0
2018-08-08T03:39:52.883Z
Speedy, aren't we?! :-)
uhoh
CC BY-SA 4.0
2018-08-08T03:52:24.173Z
Do you think there is a somewhat objective answer to [For stars around 13th magnitude, are their entries in various catalogues usually linked, or does one do this manually?](https://astronomy.stackexchange.com/q/27278/7982)
uhoh
CC BY-SA 4.0
2018-08-08T02:48:29.390Z
2018-08-08T02:48:29.390Z
Mike G
<p>From a search, I found a list of some <a href="https://archive.stsci.edu/proposal_search.php?id=15450&amp;mission=hst" rel="nofollow noreferrer">preparatory HST observations</a> made for the August 4, 2018 occultation of a star by the asteroid 2014 MU69</p>

<blockquote>
  <p>We propose observations in support of the upcoming New Horizons encounter for 2014MU69. One visit is for support observations of a star to be occulted by 2014MU69 on 2018 August 4 from which ultra-precise astrometry and shape information about the target can be derived. The second visit is for a backup epoch of astrometry on 2014MU69 itself at the end of the 2018 observing window at a time when New Horizons will also be observing the target. (minor typographical edits made)</p>
</blockquote>

<p>Five lines are shown, for measurements between <code>2018-04-30 01:03</code> and <code>01:48</code>. The target is listed as <code>MU20180804</code> but that name seems to be the <a href="https://www.boulder.swri.edu/~buie/occ/MU20180804.html" rel="nofollow noreferrer">identification of an occultation</a>, not the name of a star.</p>

<p>So far I have not figured out the actual identity of the star that was predicted to be occulted by 2014 MU69 on <code>2018-08-04</code>. </p>

<p>Here is a <a href="http://www.asteroidoccultation.com/observations/NA/MU69Binzel.pdf" rel="nofollow noreferrer">very nice prediction</a> for three occultations by 2014 MU69 last year (2017). However when I go to the <a href="http://www.asteroidoccultation.com/" rel="nofollow noreferrer">main page</a> for that asteroid occultation site and look at <code>2018-08-04</code> I don't see any events with MU69 as the asteroid!</p>

<p>See also <a href="https://space.stackexchange.com/q/29881/12102">Will the upcoming observations of occultation by “Ultima Thule” (2014 MU69) be of a single object, or two?</a></p>

<p><a href="https://i.sstatic.net/zhsyJ.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/zhsyJ.jpg" alt="Occultation by MU69 on 2018-08-04"></a></p>

CC BY-SA 4.0
2018-08-09T20:23:27.527Z
I thought that asteroids occult multiple stars seen from different parts of the world at different times on the same night. as illustrated by the image here: https://occultations.org/ ... and ... http://www.poyntsource.com/New/Global.htm
bandybabboon
<asteroids><hubble-telescope><occultation>
What star was the asteroid 2014 MU69 predicted to occult on 2018-08-04?
uhoh
# What star was the asteroid 2014 MU69 predicted to occult on 2018-08-04?

(Asked by: username_0 on 2018-08-08)

From a search, I found a list of some [preparatory HST observations](https://archive.stsci.edu/proposal_search.php?id=15450&mission=hst) made for the August 4, 2018 occultation of a star by the asteroid 2014 MU69

> We propose observations in support of the upcoming New Horizons encounter for 2014MU69. One visit is for support observations of a star to be occulted by 2014MU69 on 2018 August 4 from which ultra-precise astrometry and shape information about the target can be derived. The second visit is for a backup epoch of astrometry on 2014MU69 itself at the end of the 2018 observing window at a time when New Horizons will also be observing the target. (minor typographical edits made)

Five lines are shown, for measurements between `2018-04-30 01:03` and `01:48`. The target is listed as `MU20180804` but that name seems to be the [identification of an occultation](https://www.boulder.swri.edu/~buie/occ/MU20180804.html), not the name of a star.

So far I have not figured out the actual identity of the star that was predicted to be occulted by 2014 MU69 on `2018-08-04`.

Here is a [very nice prediction](http://www.asteroidoccultation.com/observations/NA/MU69Binzel.pdf) for three occultations by 2014 MU69 last year (2017). However when I go to the [main page](http://www.asteroidoccultation.com/) for that asteroid occultation site and look at `2018-08-04` I don't see any events with MU69 as the asteroid!

See also [Will the upcoming observations of occultation by “Ultima Thule” (2014 MU69) be of a single object, or two?](https://space.stackexchange.com/q/29881/12102)

[![Occultation by MU69 on 2018-08-04](https://i.sstatic.net/zhsyJ.jpg)](https://i.sstatic.net/zhsyJ.jpg)

**Tags:** asteroids, hubble-telescope, occultation
> **Comments:**
> **username_1**: I thought that asteroids occult multiple stars seen from different parts of the world at different times on the same night. as illustrated by the image here: https://occultations.org/ ... and ... http://www.poyntsource.com/New/Global.htm  

---

## 1 answers

### Answer by username_2 on 2018-08-08. Score: 2 | Accepted answer

A [VizieR query](http://vizier.u-strasbg.fr/viz-bin/VizieR) within 15 arcseconds of [Buie's coordinates](https://www.boulder.swri.edu/~buie/occ/MU20180804.html) returns a 13th magnitude star, variously identified as:

* 2MASS [19042146-2035362](http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ5b6a57cb8ba7&-out.add=.&-source=II/246/out&2MASS===19042146-2035362&-out.orig=o)
* UCAC4 [348-170642](http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ5b6a57e88eea&-out.add=.&-source=I/322A/out&UCAC4===348-170642&-out.orig=o)
* Gaia DR2 [4082342058110504064](http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ5b6a4af18782&-out.add=.&-source=I/345/gaia2&-c=286.08948619284%20-20.59347479448,eq=ICRS,rs=0.005&-out.orig=o)

> **Comments:**
> **username_0**: Speedy, aren't we?! :-)  
> **username_0**: Do you think there is a somewhat objective answer to [For stars around 13th magnitude, are their entries in various catalogues usually linked, or does one do this manually?](https://astronomy.stackexchange.com/q/27278/7982)  

---

