Mass of particles released by comet 12P/Pons–Brooks during 2023–2024 outbursts
Monthly Notices of the Royal Astronomical Society,
Journal Year:
2025,
Volume and Issue:
538(1), P. 470 - 479
Published: Feb. 5, 2025
ABSTRACT
During
its
most
recent
return,
comet
12P/Pons–Brooks
experienced
14
well-documented
outbursts,
observed
between
2023
June
13
and
2024
April,
at
heliocentric
distances
ranging
from
$4.26\,$
to
$0.85\,$
au.
After
perihelion,
two
additional
outbursts
were
in
summer
2024,
of
$1.20\,$
$2.26\,$
Using
observational
data,
we
developed
a
numerical
model
estimate
the
mass
ejected
during
these
events,
focusing
on
sublimation
ice
through
porous
cometary
nucleus.
The
key
factors
affecting
estimates
are
outburst
amplitude
active
surface
area
both
quiet
phases.
Pogson’s
law
was
used
express
magnitude,
incorporating
scattering
cross-sections
agglomerates.
iteratively
determined
considering
various
types
(H$_{2}$O
CO$_{2}$)
controlling
activity.
Our
results
indicate
that
ranged
10$^{10}$
10$^{13}$
kg.
findings
highlight
significant
role
morphology
thermodynamic
conditions
providing
insights
into
mechanisms
driving
phenomena
their
implications
for
evolution
dust
trail
formation.
Based
analysis
propose
six-level
classification
scheme
outbursts.
Language: Английский
Boulder Migration in the Khonsu Region of Comet 67P/Churyumov–Gerasimenko
The Astrophysical Journal,
Journal Year:
2025,
Volume and Issue:
979(1), P. 91 - 91
Published: Jan. 20, 2025
Abstract
The
European
Space
Agency's
Rosetta
mission
is
the
only
space
that
has
performed
long-term
monitoring
of
a
comet
at
close
distances.
For
over
two
years,
rendezvoused
with
67P/Churyumov–Gerasimenko,
which
revealed
diverse
evolutionary
processes
cometary
nucleus.
One
most
striking
events
migration
∼30
m
boulder
in
southern
hemisphere
region
Khonsu.
Previous
works
found
boulder's
∼140
displacement
occurred
during
three
months
from
2015
August
to
October,
and
several
triggering
mechanisms
were
proposed,
including
outburst
site,
seismic
vibrations
nearby
activities,
or
surface
erosion
slope
beneath
boulder.
In
this
work,
we
further
analyze
impressive
event
by
analyzing
imaging
data
Rosetta's
OSIRIS
camera.
We
constrained
time
within
14
hr
derived
detailed
timeline
local
dust
activities.
High-resolution
thermophysical
modeling
shows
significant
dichotomy
thermal
history
northern
sides,
could
have
triggered
facilitated
its
via
own
volatile
activity.
Language: Английский
Coma composition and profiles of comet 12P/Pons-Brooks using long-slit spectroscopy
Monthly Notices of the Royal Astronomical Society,
Journal Year:
2024,
Volume and Issue:
534(3), P. 1816 - 1826
Published: Sept. 19, 2024
ABSTRACT
Comet
12P/Pons–Brook
exhibited
multiple
large
and
minor
outbursts
in
2023
on
its
way
to
2024
perihelion,
as
it
has
done
during
previous
apparitions.
We
obtained
long-slit
optical
spectra
of
the
comet
August
November
with
INT-IDS,
December
NOT-ALFOSC.
Using
a
standard
Haser
model
10
000-km-radius
aperture
commonly
used
empirical
parent
daughter
scale
lengths,
our
calculated
abundance
ratios
show
constant
‘typical’
composition
throughout
period
C$_2$/CN
ratio
about
90
per
cent.
Molecular
density
profiles
different
species
along
slit
asymmetries
between
opposite
sides
coma
that
C$_2$
seems
behave
differently
than
CN
C$_3$.
Comparing
shows
this
cannot
accurately
reproduce
shape
coma,
therefore
production
rates
be
deemed
accurate.
an
outburst
is
slightly
better
match
C$_3$
profile
shapes,
but
still
does
not
explain
requires
equal
lengths.
Our
results
suggest
morphology
could
explained
by
extended
sources,
nature
12P’s
activity
introduces
bias
determination
composition.
Language: Английский