<p>The parallax listed in Simbad is <span class="math-container">$0.0471\pm 0.1310$</span> milliarcseconds. i.e. The parallax is consistent with zero. You can only get a lower limit to the distance from this.</p>
<p>The distance might be estimated from the brightness of the galaxy and some assumption about its intrinsic luminosity. Or you could just assume it is far enough away to be part of the Hubble flow; in which case you can estimate a distance from its redshift of 0.55.</p>
<p>Using <a href="http://www.astro.ucla.edu/%7Ewright/CosmoCalc.html" rel="nofollow noreferrer">this cosmology calculator</a> with the default cosmological parameters in a flat universe gives a light travel time of 5.4 billion years.</p>
<p>This may or not be the distance you want; there are several ways to define distance in cosmology and these are also given by the calculator referred to.</p>

CC BY-SA 4.0
2021-11-01T00:16:50.233Z
Can I determine the value for the JS from the information displayed on the Simbad page?
MiscellaneousUser
CC BY-SA 4.0
2021-11-02T00:16:41.457Z
Not totally sure what you are asking, but the redshift that @ProfRob put into the calculator is shown on the Simbad page under the `Radial velocity / Redshift / cz` heading where it gives _z(spectroscopic) 0.55_  (_z_ is the common abbreviation/symbol for redshift)
astrosnapper
CC BY-SA 4.0
2021-10-31T23:58:29.753Z
2021-10-31T23:58:29.753Z
ProfRob
<p>According to Simbad ( <a href="http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=3C+147" rel="nofollow noreferrer">http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=3C+147</a> ), the parallax is 0.0471 which would put it at a distance of 69,249 Light Years by using <a href="https://www.translatorscafe.com/unit-converter/en-us/calculator/parallax-distance/" rel="nofollow noreferrer">https://www.translatorscafe.com/unit-converter/en-us/calculator/parallax-distance/</a></p>
<p>This would put it inside or outside the Milky Way but Wikipedia puts it at 5.1 Billion which seems more correct.  Although the indirect page at Caltech says 5.2.</p>
<p>How can I calculate the distance of 3C 147 using the parallax from Simbad, by using another formula or its not possible as parallax at Simbad doesn't refer to distance.</p>

CC BY-SA 4.0
2021-10-31T23:43:15.617Z
Please add units to all the quantities in your question.
ProfRob
<parallax>
How to calculate the distance of "3C 147"
MiscellaneousUser
# How to calculate the distance of "3C 147"

(Asked by: username_0 on 2021-10-31)

According to Simbad ( <http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=3C+147> ), the parallax is 0.0471 which would put it at a distance of 69,249 Light Years by using <https://www.translatorscafe.com/unit-converter/en-us/calculator/parallax-distance/>

This would put it inside or outside the Milky Way but Wikipedia puts it at 5.1 Billion which seems more correct. Although the indirect page at Caltech says 5.2.

How can I calculate the distance of 3C 147 using the parallax from Simbad, by using another formula or its not possible as parallax at Simbad doesn't refer to distance.

**Tags:** parallax
> **Comments:**
> **username_1**: Please add units to all the quantities in your question.  

---

## 1 answers

### Answer by username_1 on 2021-10-31. Score: 2

The parallax listed in Simbad is $0.0471\pm 0.1310$ milliarcseconds. i.e. The parallax is consistent with zero. You can only get a lower limit to the distance from this.

The distance might be estimated from the brightness of the galaxy and some assumption about its intrinsic luminosity. Or you could just assume it is far enough away to be part of the Hubble flow; in which case you can estimate a distance from its redshift of 0.55.

Using [this cosmology calculator](http://www.astro.ucla.edu/%7Ewright/CosmoCalc.html) with the default cosmological parameters in a flat universe gives a light travel time of 5.4 billion years.

This may or not be the distance you want; there are several ways to define distance in cosmology and these are also given by the calculator referred to.

> **Comments:**
> **username_0**: Can I determine the value for the JS from the information displayed on the Simbad page?  
> **username_2**: Not totally sure what you are asking, but the redshift that @ProfRob put into the calculator is shown on the Simbad page under the `Radial velocity / Redshift / cz` heading where it gives _z(spectroscopic) 0.55_  (_z_ is the common abbreviation/symbol for redshift)  

---

