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Old January 7th 17, 11:08 AM posted to sci.astro
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Default 1) the negative paraxes...

Il giorno martedì 27 dicembre 2016 10:38:25 UTC+1, ha scritto:
Il giorno domenica 18 dicembre 2016 12:16:55 UTC+1, ha scritto:
Il giorno mercoledì 14 dicembre 2016 14:43:54 UTC+1, Mike Dworetsky ha scritto:
wrote:
Il giorno mercoledì 14 dicembre 2016 08:44:15 UTC+1, Poutnik ha
scritto:
Dne 13/12/2016 v 09:44 Martin Brown napsal(a):
On 12/12/2016 06:42, Poutnik wrote:


For exactly the reason I stated in the part of my reply that you
snipped: Negative values are unphysical, but form the part of the
statistical distribution of values that happen to lie below zero
when the mean is close to zero.

Positive and negative noise values are equally unphysical.

But you only know for certain that the negative values are
unphysical the positive ones could be real to within some
measurement error. Later more refined experiments may be able to
narrow down the error bars.

Later experiment can. But I speak in context of this one.
These small values are not statistically justified,
as there is high probability it is just a noice.



Imagine that someone plotted a graph of, say, a spectrum (with
low S/N), and wherever the plotted flux was below zero, they
simply truncated it. Would you be happy with that? I wouldn't.

IMHO He should truncated all measurements
with zero belonging to CI of the measurement (mean) value,
as with statistically insignificant difference to zero.

No. Provided that it is stated somewhere what the limits of
detection for the method actually is then the value determined even
if it is negative is more useful to later researchers than a "below
LOD" flag.

One thing is raw data, other thing is published processed data.
The limits should be available to a team of original data.

Such a limit can be estimated from the fluctuation around zero,
for stars where expected value is low enough.

--
Poutnik ( The Pilgrim, Der Wanderer )

A wise man guards words he says,
as they say about him more,
than he says about the subject.

..thanks for contributions to Poutnik , to Mike , to Procarytic ..and
..
.. the old negative parallaxes could keep the errors ..but , i think
, if you repeated its , you could get a very different value nearer
to the rigth-one ...
.. the new parallaxes (HTS) have four significant numbers and if you
repeat , you get the same value ( so the man ,who wrote its , let me
to understand.. ) ( the measures of Bjmag , for galaxies , have the
same five significant numbers also if repeated during years ...) ....
the 'dramaticity' is that : the negative ones are truly negative
because there are intermediate bodies ... (so that man told) ..
.. in 'google astro' you can read the topic 'Link between dark
matter.. ' ...somebody proposes that the dark matter are powders ,
stones , little asteroides.. :so, for having the mass of dark matter
,probabely the sky should be not trasparent and unable to deviate
gravitationally - or rephrationally, then we see that - the ligth for
giving the negative parallaxes ...i suppose the black dwarfes and an
universe ' age many times longer than supposed , so trasparent and
able to deviate the light ...

I don't think any of this is close to reality. Parallax is a geometric
effect due to the earth's orbital motion around the Sun. It would not have
anything to do with refraction or gravitational lensing. If you are
thinking of some sort of photometric estimation of stellar distance, this is
called "photometric parallax" but it has nothing to do with geometry.

.. untill 200-300 y.l. , the white dwrfes are visible almost without
having neg parallaxes ... after it begins the problem.. and the warm
stars ( O,B,A) are deviating the ligth easierly , nearerly ... and
the warm galaxies are desparing easierly , for the same sigth' angle

I'm not sure I understand what you are saying but early type stars have
small parallaxes because they are a long way from us. These are so small
that many measures are effectively zero so individual measures would be half
positive and half negative.

...
.. cutting some steps : in a time almost infinite , the light could
condense like matter in the outern fields and the black dwarfes could
be the fuel and engine of the galaxy..

This does not sound like any physics or astrophysics I know about.
Hand-waving is not the same as carefully reasoned analysis.

--
Mike Dworetsky

(Remove pants sp*mbl*ck to reply)


..where a gradient of concetration of gas is , there is also a rephrational deviation of light ; if the gradient is round , there is a rephrational lens ... nothing of new-one
( home exp : put 10 cm. of water into an acquarius and also 5 kg. of salt ... after two days the salt ' water shall be clear and a part of salt remains insolute on the floor ..: a laser pointer shall go through the water showing a curved beam expecially if the light is blue or green and the distance is longer than 50 cm. ... the light spot shall go out from acquarius not circular but showing a little ellipse ...)
.. the atmosphere ' rephrational lens is the reason for observing the sun a little before the rising ..and little later the sunset ..... the bending of the light is in direction of the higther rephrational ' index = concentration of gas ..
.. for many people , it seems more difficult to believe=receive=understand=keep-in-mind that , there up in the sky , there are many heavy invisible bodies (black dwarves ?) deviating the light coming from the far-space , expecially if the light has an hight frequency ...


.. somebody remember the flyby anomaly = effect etc. etc. ..just good observations : that kind of anomalies reminds to us the misterious acceleration of Pioneer 10 and 11.. and the cosmic redshift can be in the same family of phenomenas , i think .. later i shall return over that..
.. it happens often : you say same words .. many people , also clever people , read that words and they go to graze their sheeps = problems around that words , near and not so near ..
.. boys , i say : there up , almost surely there are many heavy small dark bodies ( black dwarfs ) that are deviating the light ..to the right and to the left side ...
1) the parallaxes negative are not errors because , if repeated , its give the same exact values..
2) beyond the 800-1000 y.l. ' distance , the negative parallaxes are so many that its are the 50%..
3) its are so many to explicate the dark matter because the bodies must have the weight of the sun , the dimension of few kms and cold=invisible to keep a large atmosphere ...
... so the age of universe can be much highter than suspected ... 1000 times more ? .. and the big bang ? .. we speak about later


...we present , from the Cat I/239 tyc-main in the site CDS-Strasbourg , the relations between groups of stars with higth temperature ( hight frequency of emitted light ! ) and groups with lower temperature ; we use like the temperature ' index the values of B-V and so a low value ( or negative of B-V ) shows an hight temperature ; for each group we calcule the percentage (%) of negative relieved parallaxes in that goup ; the logics of the dark heavy bodies ( black dwarfes = dark matter ? ) foresees that a far body produces an hight deviation ( positive or negative ) because the deviation begins probabely from far-away , consequentely the red giant stars ( which have low temperature but are far-away ) produce an hight percentage (%) of negative parallaxes , while the nearest stars produce only positive parallaxes ; the stars groups are composed by around 200-2000 elements

stars with B-V -0.4 49% of neg. plx. (group of stars containing expecially O,B and A stars)

stars with B-V -0.25&-0.3 47% of neg. plx.

stars with B-V -0.01&-0.018 42% of neg. plx.

stars with B-V 0.2&0.198 40% of neg. plx.

stars with B-V 0.5&0.498 41% of neg. plx.

stars with B-V 0.9&0.898 46% of neg. plx. (group of stars containing expecially red giants)

stars with B-V 1.9&1.85 44% of neg. plx.

stars with B-V 2.7&2.2 44% of neg.plx.

stars with B-V 2.7 34% of neg. plx...