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(meteorobs) Re: JBO from Xinglong, China on June 28/29
Huan Meng and All,
First of all Rainer has asked us not to use area 14 (Cygnus) as there are
just too many stars located too close together. You will never get a true LM
estimate using this area. Area 14 will be replaced in the not too distant
future.
There are two possibilities involving Huan Meng here. One being that he is
in that group of observers who detects motion exceedingly well, therefore
sees many more meteors than normal. The other possibility is that he is
counting inner ocular eye flashes as meteors. I had this trouble with this
when I first started. They gradually subsided with experience as I concluded
that most of the streaks/flashes I was seeing near the brighter stars were
not really meteors.
Bob
----- Original Message -----
From: "Huan Meng" <meteorobs_menhu@hotmail.com>
To: <meteorobs@atmob.org>; "Mark Davis" <sc_meteors@hotmail.com>; "Rainer
Arlt" <rarlt@aipdot de>
Cc: "Robert Lunsford" <lunro.imo.usa@coxdot net>
Sent: Sunday, June 29, 2003 12:28 PM
Subject: JBO from Xinglong, China on June 28/29
> Hello, everyone,
>
> here is my report for the night of June 28/29. on that night, I monitored
for the first three hours, and Jin for the last two. his record is being
processed and will be posted soon as well.
> A comparison between Jin's report and that of mine for 27/28, which is
questioned by Rainer and Bob, should be necessary for any possible problem.
>
> I'd like to add two comments here:
>
> 1. On the night of 27/28, some sporadic meteors were from the southeast
corner of the sky. this might indicate some meteor acitivity other than JBO
on the ecliptic(Aquarius and Capricornus?)
> I should point that those meteor increased the number in column of
'sporadic', but not change its order. (As in my mind, perhaps two such
meteors in my formal observing period? detailed number should be obtained
only if i check my original tape record...) Coincidentally, three such
meteors occurred within the first 5 minutes once the weather became clear.
And all of them are very bright, i.e. -1, -2 and -4 (see my essay in
previous report). I just received a phone call from another group of
observers, and got known some other observers in China also notice the these
meteors.
>
> 2. (especially to Bob) my method of estimating the limiting magnitude was
IMO's 'star counting'. I've attached my full original records in my last
email. You see, '#14, N=6' meant I saw 6 stars in No.14 area (in Cygnus).
the limiting magnitude given in the summary table was an average value for
all the estimating countings.
>
> However, I just made a quick examination for the 2nd period of my 28/29
report (below). If we assume the population index of sporadic meteors to be
3, then LM=5.4 means a facter of 3^(6.5-5.4)=3.35. So the sporadic hourly
rate was 33*3.35/2.23=50. This rate is still above the order of 10-15.
>
>
> ===
> Visual Observing Form - Summary Report
>
> Day: 28/29 Month: 06 Year: 2003 Begin: 13h54m End: 16h49m
>
> Location long. 117°34'42"E latit. 40°32'47"N IMO code: 30015
>
> Site: Xinglong, Hebei Country: China
>
> Observer: Huan MENG IMO code: MENHU
> Surname (family name) with CAPITAL LETTERS; only SINGLE PERSONS
>
> Showers:
> -------------------------------------------------------------------------
> | Shw |alpha|delta| Shw |alpha|delta| Shw |alpha|delta| Shw
|alpha|delta|
>
|-------------------------------------------------------------------------|
> | JBO | 224 | +48 | | | | | | | | |
|
> -------------------------------------------------------------------------
>
> -----------------------------------------------------------------------
> | Period |Field |Teff| F | lm | JBO| ___| ___| ___| ___| ___|
___|Spor|
> | (UT) |RA Dec| h | | m |M| N|M| N|M| N|M| N|M| N|M| N|M| N|M|
N|
>
|-----------------------------------------------------------------------|
> 1|1354-1421|250|+40|0.45|1.1| 5.7|C| 2| | | | | | | | | | | | |C|
6|
> -----------------------------------------------------------------------
> 2|1423-1649|270|+40|2.23|1.1| 5.4|C| 4| | | | | | | | | | | |
|C|33|
> -----------------------------------------------------------------------
>
> -------------------------------------------------------------------------
----
> |Shower |-8|-7|-6|-5|-4|-3| -2| -1 | 0 |+1 | +2 | +3 | +4 | +5 | +6 | +7|
tot|
>
|--------|--|--|--|--|--|--|---|----|---|---|----|----|----|----|----|---|--
--|
> |JBO 1 | 0| 0| 0| 0| 0| 0| 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 0 |
2 |
>
|--------|--|--|--|--|--|--|---|----|---|---|----|----|----|----|----|---|--
--|
> |JBO 2 | 0| 0| 0| 0| 0| 0| 0 | 0 | 0 | 0 | 0 | 1 | 3 | 0 | 0 | 0 |
4 |
>
|--------|--|--|--|--|--|--|---|----|---|---|----|----|----|----|----|---|--
--|
> |spor. 1 | 0| 0| 0| 0| 0| 0| 0 | 0 | 0 | 0 | 1.5| 1.5| 3 | 0 | 0 | 0 |
6 |
>
|--------|--|--|--|--|--|--|---|----|---|---|----|----|----|----|----|---|--
--|
> |spor. 2 | 0| 0| 0| 0| 0| 0| 0 | 0 | 4 | 3 | 4 | 11 | 9 | 2 | 0 | 0 |
33 |
> -------------------------------------------------------------------------
----
>
>
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