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(meteorobs) Jan 12/13 followup observations for anti-apex meteors.
My intriguing results of 7 meteors observed from a Pisces area/anti-apex
radiant early in the evening of Jan 11/12, encouraged me to attempt
another followup session the next evening, despite poor forecast
conditions. So, I drove up to the summit of Haleakala again, but was
frustrated by a rare invasion of high cirrus that severely hampered my
observations.
Only 2 anti-apex meteors, and 11 total meteors were seen in 1.75 hr of
Teff. That compares to 7 anti-apex & 28 total in 2.75 Teff the evening
before. Given the poorer data on Jan 12/13 vs Jan 11/12, I think the
results are inconclusive.
Further followup early-evening observations are indicated, but the
waxing moon will present worsening conditions from now on.
Does anyone have any information or personal observations on this
anti-apex radiant, 90° east of the Sun?
Mike Linnolt
REPORT FOLLOWS:
-----------------------------------------------------------------------
OBS: Mike Linnolt (LINMI)
DATE: Jan. 13, 2000
TIME: 0520 - 0800 UT (7:20pm - 10:00pm HST Jan 12/13)
LOC: Haleakala NP, Maui, HI (20° 40' N, 156° 20m W)
ELEV: 3000m & 2050m
Conditions: Sky partially obscured by cirrus. Temp 50F. RH 70%. Winds
light.
METHOD: Paper
Observing Periods Summary:
==========================
# Period(UT) FOV Teff F LM DCA Anti-a Lynx SPO
---------- --- ---- - -- --- ------ ---- ---
1 0520-0630 various 1.0 1.33 <=5.7 0 1 0 5
2 0715-0800 various 0.75 1.25 <=6.0 1 1 0 3
Periods Detail:
===============
Period #1:
----------
Mag->_-3___-2___-1____0___+1___+2___+3___+4___+5___+6
-------+----+----+----+----+----+----+----+----+----+
DCA:................................................. = 0
Ant:......................................1.......... = 1
Lyn:................................................. = 0
SPO:............................2....2....1.......... = 5
DEAD TIME: 10 min
ELEV: 3000m
FOV: Changing due to necessity of avoiding cloud cover.
Note: Conditions were poor. Substantial high cirrus created highly
variable observing conditions, with variable obscuration and LM.
LM was 5.7 during the clearest openings, but reduced substantially
during more overcast times. I was specifically looking for
confirmation of significant anti-apex activity observed during this
time period 24hrs ago. Due to poor conditions, these results seem
inconclusive. But, clearly there was no repeat of the brighter
anti-apex meteors of Jan 12.
Period #2:
----------
Mag->_-3___-2___-1____0___+1___+2___+3___+4___+5___+6
-------+----+----+----+----+----+----+----+----+----+
DCA:......................................1.......... = 1
Ant:......................................1.......... = 1
Lyn:................................................. = 0
SPO:.................................1....1....1..... = 3
DEAD TIME: 0 min
ELEV: 2050m
FOV: Changing due to necessity of avoiding cloud cover.
Note: Less cirrus cloud cover compared to period #1. I moved to a
lower elevation for this period. LM 6.0 at best, but still variable.
END OF REPORT.
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