Some physical parameters and luminescent cometary
continuum in spectra of comets 81P/Wild 2,
103P/Hartley 2, C/2009 K5 (McNaught)
103P_CS-(SS+LC)
2.1
Flux, (Photon/(A*dm2*s))
1.8
1.5
1.2
0.9
0.6
0.3
5180
5080
4980
4880
4780
Lambda, A
4680
4580
4480
4380
4280
4180
4080
3980
-0.3
3880
0
V.O. Ponomarenko, K.I. Churyumov,
V.V. Kleshchonok, O.R. Baransky
Astronomical Observatory, Kyiv Shevchenko National
University, Ukraine
[email protected], [email protected]
“Zeiss-600”
(D=0.6 m)
“Zeiss”
(D=2 m)
Robotize
d
telescope
(D=0.35
m)
The spectra were obtained in 2010 year with the
help of the 2-m Zeiss reflector (F1=16; F2=72 м)
of the High-mountain astronomical station of
Institute of Astronomy of Russian Academy of
Sciences and Main Astronomical Observatory
of National Academy of Sciences of Ukraine at
Peak Terskol
2-m reflector “Carl Zeiss”
The wavelength diapasons are 4500-8500 ÅÅ for echelle and 3800-5200 ÅÅ for
slit spectra
The slit spectrum of comet 103P/Hartley 2
The slit spectrum of comet С/2009 K5 (McNaught).
The slit spectrum of comet 81P/Wild 2.
Comet C/2009K5 (McNaught) had:
− heliocentric
− geocentric
− integral
С/2009 K5, «Terskol», Zeiss600, Filter С2, 25.03.2010 р.
distance r=1.5 A.U.
distance Δ=1.4 A.U.
magnitude T=11 mag,
− phase
angle S-T-O=400,
− elongation
angle S-O-T=750.
С/2009 K5, «Terskol», Zeiss600, Filter GC, 02.06.2010 р.
The observations were made in March-April
2010.
2 echelle-spectra (R=15000) and 4 slit-spectra
(R=1500) were obtained.
Detection of the fluorescent continuum of comet C/2009 K5
(McNaught)
Blue – comet spectrum; pink – Sun spectrum+fluorescent continuum;
red – fluorescent continuum.
C/2009K5
4950
4850
4750
4650
Lambda, A
4550
4450
4350
4250
4150
4050
3950
3850
Intensity %
100
90
80
70
60
50
40
30
20
10
0
The contribution of the fluorescent continuum in flux of
the Sun for comet C/2009 K5 (McNaught)
Pink – ratio of the flux of comet to the absolute flux of Sun (%);
Lambda, A
4950
4850
4750
4650
4550
4450
4350
4150
4050
3950
100
90
80
70
60
50
40
30
20
10
0
4250
LC/SS (%)+CS/SSr (%)
3850
Intensity, %
red – ratio of the flux fluorescent continuum to total flux (%).
103Р, «Terskol», Zeiss-600,
narrow-band filter С2,
25.10.2010
103Р, «Terskol», Zeiss-600,
narrow-band filter С3,
24.10.2010
103Р, «Terskol», Zeiss-600,
narrow-band filter СN,
25.10.2010
Comet 103P/Hartley 2 had:
− heliocentric distance r=1.0 A.U.
− geocentric distance Δ=0.12 A.U.
− integral magnitude T=9.1 mag,
− elongation angle S-O-T=1160,
− phase angle S-T-O=550.
The observations were made in October 2010.
9 echelle-spectra (R=15000) and 8 slit-spectra (R=1500) were obtained.
Detection of the fluorescent continuum of comet 103P/Hartley 2
Icom(λ) = Ie(λ) + Is(λ) + I LC(λ)
Blue – comet spectrum; pink – Sun spectrum+fluorescent continuum;
red – fluorescent continuum
103P
4
3
2.5
2
1.5
1
0.5
Lambda, A
5180
5080
4980
4880
4780
4680
4580
4480
4380
4280
4180
4080
3980
0
3880
Flux, (Photon/(A*dm2*s))
3.5
The contribution of the fluorescent continuum in flux of
the Sun for comet 103P/Hartley 2
Icom(λ)=k*If(λ)+LC
Pink – ratio of the flux of comet to the absolute flux of Sun (%);
red – ratio of the flux fluorescent continuum to total flux (%).
(LC/SS)%+(CS/SSr)%
Lambda, A
5180
5080
4980
4880
4780
4680
4580
4480
4380
4280
4180
4080
3980
3880
Intensity, %
100
90
80
70
60
50
40
30
20
10
0
Identification of the comets emission lines
Analysis of the comets and emissions lines for comet
103Р/Hartley 2 and C/2009 K5 (McNaught) (spectral
range 4690-7000 ÅÅ)
comet
C2
NH2
Unid
H2O+
[OI]
CN
all
103P
928
162
651
25
3
24
1795
C/2009K5
1248
189
674
31
3
36
2184
Comet 81P/Wild 2 had:
− heliocentric distance r=1.6 A.U.,
− geocentric distance Δ=0.7 A.U.,
− integral magnitude T=10.7 mag,
− phase angle S-T-O=130,
− elongation angle S-O-T=1570
The observations were made
in 03/04.2010
2 echelle-spectra (R=15000)
and 6 slit-spectra (R=1500)
were obtained
The picture of comet 81P/Wild 2
was obtained at the Lisnyky station
(MPC - 585) on 10 March, 2010
Detection of the fluorescent continuum of comet 81P/Wild 2
Blue – comet spectrum; pink – Sun spectrum+fluorescent continuum;
red – fluorescent continuum.
81P
Lambda, A
4950
4850
4750
4650
4550
4450
4350
4250
4150
4050
3950
3850
Intensity, %
100
90
80
70
60
50
40
30
20
10
0
The contribution of the fluorescent continuum in flux of
the Sun for the comet 81Р/Wild 2
Pink – ratio of flux of comets to real flux of Sun (%);
red – ratio of flux fluorescent continuum to all flux (%)
LC/SS (%) + CS/SS (%)
4950
4850
4750
4650
Lambda, A
4550
4450
4350
4250
4150
4050
3950
3850
100
90
80
70
60
50
40
30
20
10
0
CONCLUSIONS
1. Fluorescent cometary continuum level (nonsolar origin) in the spectra of
comets was detected.
2. Parameters of fluorescent continuum was obtained (wavelength
3800 Å < λ < 5000 Å). Peculiarities of fluorescent continuum of comets are
discussed.
3. The energy distributions of fluorescent continuum in the spectra for the near
nucleus regions of two comets are built.
4. The contribution of the fluorescent continuum in flux
of the Sun for all comets are similar. Maximum
contribution equal 40% on the wavelength 3950 Å.
5. Identification of the spectral emission lines in
these spectra was made.