<p>Stars have multiple names when they are included in multiple catalogues.</p>
<p>The designation <span class="math-container">$\alpha$</span> And is the name in the <a href="https://en.wikipedia.org/wiki/Bayer_designation" rel="noreferrer">Bayer classification</a>.</p>
<p>21 And is the same star's name in the <a href="https://en.wikipedia.org/wiki/Flamsteed_designation" rel="noreferrer">catalogue compiled by John Flamsteed</a>.</p>
<p>If you run <a href="https://simbad.cds.unistra.fr/simbad/sim-id?Ident=Alpha%20And&amp;NbIdent=1&amp;Radius=2&amp;Radius.unit=arcmin&amp;submit=submit%20id" rel="noreferrer">this query</a> through the CDS &quot;SIMBAD&quot; database you can see all the names of this star (there are 60 listed).</p>
<p><a href="https://i.sstatic.net/0kdVH.png" rel="noreferrer"><img src="https://i.sstatic.net/0kdVH.png" alt="SIMBAD identifiers for Alpha And" /></a></p>

CC BY-SA 4.0
2023-05-19T17:28:43.590Z
He, and it even has twice the name 'Hip 677' :)
planetmaker
CC BY-SA 4.0
2023-05-19T16:49:24.077Z
2023-05-19T16:49:24.077Z
ProfRob
<p>I'm revising the Hipparcos catalogue and I've found that alpha Andromeda and 21 Andromedae has the same HIP (677).</p>
<p>Why alpha Andromedae is also known as 21 Andromedae?</p>

<constellations>
Why alpha Andromedae is also known as 21 Andromedae?
VansFannel
# Why alpha Andromedae is also known as 21 Andromedae?

(Asked by: username_0 on 2023-05-19)

I'm revising the Hipparcos catalogue and I've found that alpha Andromeda and 21 Andromedae has the same HIP (677).

Why alpha Andromedae is also known as 21 Andromedae?

**Tags:** constellations

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## 1 answers

### Answer by username_1 on 2023-05-19. Score: 6 | Accepted answer

Stars have multiple names when they are included in multiple catalogues.

The designation $\alpha$ And is the name in the [Bayer classification](https://en.wikipedia.org/wiki/Bayer_designation).

21 And is the same star's name in the [catalogue compiled by John Flamsteed](https://en.wikipedia.org/wiki/Flamsteed_designation).

If you run [this query](https://simbad.cds.unistra.fr/simbad/sim-id?Ident=Alpha%20And&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit%20id) through the CDS "SIMBAD" database you can see all the names of this star (there are 60 listed).

[![SIMBAD identifiers for Alpha And](https://i.sstatic.net/0kdVH.png)](https://i.sstatic.net/0kdVH.png)

> **Comments:**
> **username_2**: He, and it even has twice the name 'Hip 677' :)  

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