J/A+A/667/A81 Asteroids absolute colors and phase coeff. (Alvarez-Candal+, 2022)
Absolute colors and phase coefficients of asteroids.
Alvarez-Candal A. Jimenez Corral S.. Colazo M.
<Astron. Astrophys. 667, A81 (2022)>
=2022A&A...667A..81A 2022A&A...667A..81A (SIMBAD/NED BibCode)
ADC_Keywords: Minor planets ; Colors; Magnitudes, absolute; Photometry, ugriz
Keywords: methods: data analysis - catalogs - minor planets, asteroids: general
Abstract:
We use phase curves of small bodies to measure absolute magnitudes
and, together with complementary theoretical and laboratory results,
to understand their surfaces' micro and macroscopic properties.
Although we can observe asteroids up to phase angles of about 30deg,
the range of phase angles covered by outer solar system objects
usually does not go further than 7 to 10deg for centaurs and 2deg
for trans-Neptunian objects, and a linear relation between magnitude
and phase angle may be assumed.
We aim at directly comparing data taken for objects in the inner solar
system (inside the orbit of Jupiter) with data of centaurs and
trans-Neptunian objects.
We use the SLOAN Moving Objects Catalog data to construct phase curves
restricted to phase angles less than or equal to 7.5deg, compatible
with the angles observed for the trans-Neptunian/Centaur population.
We assume a linear model for the photometric behavior to obtain
absolute magnitudes and phase coefficients in the ugirz, V, and R
filters.
We obtained absolute magnitudes in seven filters for >4000 objects.
Our comparison with outer solar system objects points to a common
property of the surfaces: intrinsically redder objects become blue
with increasing phase angle, while the opposite happens for
intrinsically bluer objects.
Description:
Phase curves parameters at low phase angle and using a linear
photometric model for about 5k minor bodies in the ugriz systems plus
Jhonson's V and R (obtained from transforming ugriz magnitudes). For
each objects are given the absolute magnitudes and phase
coefficients, their respective uncertainties, and the minimum phase
angle and total span in phase angle.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 436 5848 Absolute magnitudes and phase coefficients
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See also:
B/astorb : Orbits of Minor Planets (Bowell+ 2014)
J/A+A/657/A80 : Asteroids phase curves using SLOAN MOC (Alvarez-Candal,+, 2022)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Object Designation of the minor body
14- 22 F9.4 mag Hu ?=-10 Absolute magnitude in the u filter
24- 31 F8.4 mag e_Hu ?=-10 Lower uncertainty in Hu
33- 40 F8.4 mag E_Hu ?=-10 Upper uncertainty in Hu
44- 45 I2 --- o_Hu Number of observation in the u filter
46- 54 F9.4 mag Hg ?=-10 Absolute magnitude in the g filter
56- 63 F8.4 mag e_Hg ?=-10 Lower uncertainty in Hg
65- 72 F8.4 mag E_Hg ?=-10 Upper uncertainty in Hg
76- 77 I2 --- o_Hg Number of observation in the g filter
78- 86 F9.4 mag Hr ?=-10 Absolute magnitude in the r filter
88- 95 F8.4 mag e_Hr ?=-10 Lower uncertainty in Hr
97-104 F8.4 mag E_Hr ?=-10 Upper uncertainty in Hr
108-109 I2 --- o_Hr Number of observation in the r filter
110-118 F9.4 mag Hi ?=-10 Absolute magnitude in the i filter
120-127 F8.4 mag e_Hi ?=-10 Lower uncertainty in Hi
129-136 F8.4 mag E_Hi ?=-10 Upper uncertainty in Hi
140-141 I2 --- o_Hi Number of observation in the i filter
143-151 F9.5 mag Hz ?=-10 Absolute magnitude in the z filter
152-159 F8.4 mag e_Hz ?=-10 Lower uncertainty in Hz
161-168 F8.4 mag E_Hz ?=-10 Upper uncertainty in Hz
172-173 I2 --- o_Hz Number of observation in the z filter
174-182 F9.4 mag HV ?=-10 Absolute magnitude in the V filter
184-191 F8.4 mag e_HV ?=-10 Lower uncertainty in HV
193-200 F8.4 mag E_HV ?=-10 Upper uncertainty in HV
204-205 I2 --- o_HV Number of observation in the V filter
206-214 F9.4 mag HR ?=-9 Absolute magnitude in the R filter
216-223 F8.4 mag e_HR ?=-9 Lower uncertainty in HR
225-232 F8.4 mag E_HR ?=-9 Upper uncertainty in HR
236-237 I2 --- o_HR Number of observation in the R filter
239-246 F8.4 --- betau ?=-10 Phase coefficient in the u filter
248-255 F8.4 --- e_betau ?=-10 Lower uncertainty in betau
257-264 F8.4 --- E_betau ?=-10 Upper uncertainty in betau
266-273 F8.4 --- betag ?=-10 Phase coefficient in the g filter
275-282 F8.4 --- e_betag ?=-10 Lower uncertainty in betag
284-291 F8.4 --- E_betag ?=-10 Upper uncertainty in betag
293-300 F8.4 --- betar ?=-10 Phase coefficient in the r filter
302-309 F8.4 --- e_betar ?=-10 Lower uncertainty in betar
311-318 F8.4 --- E_betar ?=-10 Upper uncertainty in betar
320-327 F8.4 --- betai ?=-10 Phase coefficient in the i filter
329-336 F8.4 --- e_betai ?=-10 Lower uncertainty in betai
338-345 F8.4 --- E_betai ?=-10 Upper uncertainty in betai
347-354 F8.4 --- betaz ?=-10 Phase coefficient in the z filter
356-363 F8.4 --- e_betaz ?=-10 Lower uncertainty in betaz
365-372 F8.4 --- E_betaz ?=-10 Upper uncertainty in betaz
374-381 F8.4 --- betaV ?=-10 Phase coefficient in the V filter
383-390 F8.4 --- e_betaV ?=-10 Lower uncertainty in betaV
392-399 F8.4 --- E_betaV ?=-10 Upper uncertainty in betaV
401-408 F8.4 --- betaR ?=-9 Phase coefficient in the R filter
410-417 F8.4 --- e_betaR ?=-9 Lower uncertainty in betaR
419-426 F8.4 --- E_betaR ?=-9 Upper uncertainty in betaR
428-431 F4.2 deg am Minimum phase angle
433-436 F4.2 deg Da Range of phase angle covered
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Acknowledgements:
Alvaro Alvarez-Candal, varobes(at)gmail.com
(End) Alvaro Alvarez-Candal [IAA, Spain], Patricia Vannier [CDS] 23-Sep-2022