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| (B.Carry, 2024) | ||
| ================================================================================ | ||
| FINK SSOFT | ||
| B.Carry, J. Peloton, R. Le Montagner, M. Mahlke, J. Berthier | ||
| =References ? | ||
| ================================================================================ | ||
| Keywords: | ||
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| Abstract: | ||
| Large sky surveys provide numerous non-targeted observations of small bodies | ||
| of the Solar System. The upcoming Legacy Survey of Space and Time (LSST) of | ||
| the Vera C. Rubin observatory will be the largest source of small body | ||
| photometry in the next decade. With non-coordinated epochs of observation, | ||
| colors, and therefore taxonomy and composition, can only be computed by | ||
| comparing absolute magnitudes obtained in each filter by solving the phase | ||
| function (evolution of brightness of the small body against the solar phase | ||
| angle). Current models in use in the community (HG, HG12* , HG1G2) however | ||
| fail to reproduce the long-term photometry of many targets due to the change | ||
| in aspect angle between apparitions. We aim at deriving a generic yet | ||
| simple phase function model accounting for the variable geometry of the small | ||
| bodies over multiple apparitions. As a spinoff of the HG1 G2 model, | ||
| we propose the sHG1 G2 phase function model in which we introduce a term | ||
| describing the brightness changes due to spin orientation and polar | ||
| oblateness. We apply this new model to 13,245,908 observations of 122,675 | ||
| SSOs. These observations were acquired in the g and r filters with the Zwicky | ||
| Transient Facility between 2019/11/01 and 2023/12/01. We retrieve them and | ||
| implement the new sHG1 G2 model in Fink, a broker of alerts designed for the | ||
| LSST. The sHG1 G2 model leads to smaller residuals than other phase | ||
| function models, providing a better description of the photometry of | ||
| asteroids. We determine the absolute magnitude H and phase function | ||
| coefficients (G1 , G2 ) in each filter, the spin orientation (α0 , δ0 ), and | ||
| the polar-to-equatorial oblateness R for 95,593 Solar System Objects (SSOs), | ||
| which constitutes about a tenfold increase in the number of characterized | ||
| objects compared to current census. The application of the sHG1 | ||
| G2 model on ZTF alert data using the FINK broker shows that the model is | ||
| appropriate to extract physical properties of asteroids from multi-band and | ||
| sparse photometry, such as the forthcoming LSST survey. | ||
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| Description: | ||
| ZTF photometry, FINK broker | ||
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| File Summary: | ||
| -------------------------------------------------------------------------------- | ||
| FileName Lrecl Records Explanations | ||
| -------------------------------------------------------------------------------- | ||
| ReadMe 80 . this file | ||
| fink_cds.cds 564 122675 Published version of FINK SSOFT | ||
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| -------------------------------------------------------------------------------- | ||
| Byte-by-byte Description of file: ../fink_cds.csv.cds | ||
| -------------------------------------------------------------------------------- | ||
| Bytes Format Units Label Explanations | ||
| -------------------------------------------------------------------------------- | ||
| 1- 6 I6 --- sso_number Official IAU number | ||
| 8- 24 A17 --- sso_name Official IAU designation | ||
| 26- 28 I3 --- n_obs Total number of observations | ||
| 30- 32 I3 --- n_obs_g Number of observations in g filter | ||
| 34- 36 I3 --- n_obs_r Number of observations in r filter | ||
| 38- 43 F6.2 --- min_phase Minimum phase angle of obserations | ||
| 45- 50 F6.2 --- min_phase_g Minimum phase angle of obserations in g filter | ||
| 52- 57 F6.2 --- min_phase_r Minimum phase angle of obserations in r filter | ||
| 59- 65 F7.2 --- max_phase Maximum phase angle of obserations | ||
| 67- 73 F7.2 --- max_phase_g Maximum phase angle of obserations in g filter | ||
| 75- 81 F7.2 --- max_phase_r Maximum phase angle of obserations in r filter | ||
| 83- 88 F6.1 --- n_days Number of days covered by observations | ||
| 90- 95 F6.1 --- n_days_g Number of days covered by observations in g filter | ||
| 97-102 F6.1 --- n_days_r Number of days covered by observations in r filter | ||
| 104-109 F6.2 --- HG_H_g Absolute magnitude H in HG model in g filter | ||
| 111-116 F6.2 --- HG_dH_g Uncertainty on the absolute magnitude H in HG model in g filter | ||
| 118-122 F5.2 --- HG_G_g Phase slope G in HG model in g filter | ||
| 124-129 F6.2 --- HG_dG_g Uncertainty on phase slope G in HG model in g filter | ||
| 131-136 F6.2 --- HG_H_r Absolute magnitude H in HG model in r filter | ||
| 138-142 F5.2 --- HG_dH_r Uncertainty on the absolute magnitude H in HG model in r filter | ||
| 144-148 F5.2 --- HG_G_r Phase slope G in HG model in r filter | ||
| 150-155 F6.2 --- HG_dG_r Uncertainty on phase slope G in HG model in r filter | ||
| 157-161 F5.2 --- HG_rms RMS residuals of HG model | ||
| 163-167 F5.2 --- HG_rms_g RMS residuals of HG model in g filter | ||
| 169-173 F5.2 --- HG_rms_r RMS residuals of HG model in r filter | ||
| 175-182 F8.2 --- HG_chi2red Chi-square of HG model | ||
| 184-185 I2 --- HG_status Fit status of HG model | ||
| 187-187 I1 --- HG_fit Quality code of the fit of HG model | ||
| 189-194 F6.2 --- HG1G2_H_g Absolute magnitude H in HG1G2 model in g filter | ||
| 196-206 F11.2 --- HG1G2_dH_g Uncertainty on the absolute magnitude H in HG1G2 model in g filter | ||
| 208-212 F5.2 --- HG1G2_G1_g Phase slope G1 in HG1G2 model in g filter | ||
| 214-224 F11.2 --- HG1G2_dG1_g Uncertainty on phase slope G1 in HG1G2 model in g filter | ||
| 226-230 F5.2 --- HG1G2_G2_g Phase slope G2 in HG1G2 model in g filter | ||
| 232-242 F11.2 --- HG1G2_dG2_g Uncertainty on phase slope G2 in HG1G2 model in g filter | ||
| 244-249 F6.2 --- HG1G2_H_r Absolute magnitude H in HG1G2 model in r filter | ||
| 251-261 F11.2 --- HG1G2_dH_r Uncertainty on the absolute magnitude H in HG1G2 model in g filter | ||
| 263-267 F5.2 --- HG1G2_G1_r Phase slope G1 in HG1G2 model in r filter | ||
| 269-279 F11.2 --- HG1G2_dG1_r Uncertainty on phase slope G1 in HG1G2 model in r filter | ||
| 281-285 F5.2 --- HG1G2_G2_r Phase slope G2 in HG1G2 model in r filter | ||
| 287-296 F10.2 --- HG1G2_dG2_r Uncertainty on phase slope G2 in HG1G2 model in r filter | ||
| 298-302 F5.2 --- HG1G2_rms RMS residuals of HG1G2 model | ||
| 304-308 F5.2 --- HG1G2_rms_g RMS residuals of HG1G2 model in g filter | ||
| 310-314 F5.2 --- HG1G2_rms_r RMS residuals of HG1G2 model in r filter | ||
| 316-323 F8.2 --- HG1G2_chi2red Chi-square of HG1G2 model | ||
| 325-326 I2 --- HG1G2_status Fit status of HG1G2 model | ||
| 328-328 I1 --- HG1G2_fit Quality code of the fit of HG1G2 model | ||
| 330-335 F6.2 --- SHG1G2_H_g Absolute magnitude H in sHG1G2 model in g filter | ||
| 337-347 F11.2 --- SHG1G2_dH_g Uncertainty on absolute magnitude H in sHG1G2 model in g filter | ||
| 349-353 F5.2 --- SHG1G2_G1_g Phase slope G1 in sHG1G2 model in g filter | ||
| 355-365 F11.2 --- SHG1G2_dG1_g Uncertainty on phase slope G1 in sHG1G2 model in g filter | ||
| 367-371 F5.2 --- SHG1G2_G2_g Phase slope G2 in sHG1G2 model in g filter | ||
| 373-383 F11.2 --- SHG1G2_dG2_g Uncertainty on phase slope G2 in sHG1G2 model in g filter | ||
| 385-390 F6.2 --- SHG1G2_H_r Absolute magnitude H in sHG1G2 model in r filter | ||
| 392-402 F11.2 --- SHG1G2_dH_r Uncertainty on absolute magnitude H in sHG1G2 model in r filter | ||
| 404-408 F5.2 --- SHG1G2_G1_r Phase slope G1 in sHG1G2 model in r filter | ||
| 410-419 F10.2 --- SHG1G2_dG1_r Uncertainty on phase slope G1 in sHG1G2 model in r filter | ||
| 421-425 F5.2 --- SHG1G2_G2_r Phase slope G2 in sHG1G2 model in r filter | ||
| 427-436 F10.2 --- SHG1G2_dG2_r Uncertainty on phase slope G2 in sHG1G2 model in r filter | ||
| 438-442 F5.2 --- SHG1G2_R Oblateness | ||
| 444-450 F7.2 --- SHG1G2_dR Uncertainty on oblateness | ||
| 452-458 F7.2 --- SHG1G2_alpha0 Right Ascension of the spin vector (deg.) | ||
| 460-465 F6.2 --- SHG1G2_delta0 Declination of the spin vector (deg.) | ||
| 467-473 F7.2 --- SHG1G2_alpha0_alt Right Ascension of the spin vector (deg.), symmetric solution | ||
| 475-480 F6.2 --- SHG1G2_delta0_alt Declination of the spin vector (deg.), symmetric solution | ||
| 482-494 F13.2 --- SHG1G2_dalpha0 Uncertainty on the Right Ascension of the spin vector (deg.) | ||
| 496-506 F11.2 --- SHG1G2_ddelta0 Uncertainty on the Declination of the spin vector (deg.) | ||
| 508-514 F7.2 --- SHG1G2_obliquity Obliquity of the target (deg) | ||
| 516-520 F5.2 --- SHG1G2_min_cos_lambda Minimum cosine of the aspect angle Lambda | ||
| 522-526 F5.2 --- SHG1G2_mean_cos_lambda Mean cosine of the aspect angle Lambda | ||
| 528-532 F5.2 --- SHG1G2_max_cos_lambda Maximum cosine of the aspect angle Lambda | ||
| 534-538 F5.2 --- SHG1G2_rms RMS residuals of sHG1G2 model | ||
| 540-544 F5.2 --- SHG1G2_rms_g RMS residuals of sHG1G2 model in g filter | ||
| 546-550 F5.2 --- SHG1G2_rms_r RMS residuals of sHG1G2 model in g filter | ||
| 552-559 F8.2 --- sHG1G2_chi2red Chi-square of sHG1G2 model | ||
| 561-562 I2 --- sHG1G2_status Fit status of sHG1G2 model | ||
| 564-564 I1 --- sHG1G2_fit Quality code of the fit of sHG1G2 model | ||
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| See also: | ||
| None | ||
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| Acknowledgements: | ||
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| References: | ||
| ================================================================================ | ||
| (prepared by author / pyreadme ) |
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