v4.3.1

• Image processing bug was fixed
• Added new minor body names & number
• Update of bibcodes

v4.3.0

General:

• Color processing refactoring
• Support for color system conversions
• Color matching functions were replaced by CIE XYZ (1931)
• Better comet name index detection
• DeprecationWarning for Pillow 13 was fixed
• Bug fixes

GUI:

• Inputs for the color space and white point (replacing the sRGB mode)
• Instant preview update when changing settings (for images too)
• The brightness scale factor was moved to the settings sidebar
• Magnitude exposure system for the Tab 3 was removed
• Green Dinkinesh Easter egg was removed
• The plot displays RGB CMFs regardless of the settings

Database:

• Improved various TNO albedos
• Added 2000 CF105 and 2000 FZ53

Notes

• the old "sRGB mode" enabled corresponds to the sRGB color space with the illuminant E white point
• the old "sRGB mode" disabled corresponds to the CIE RGB color space with the illuminant E white point

v4.2.0

General:

• Added global search function
• Added support for emission spectrum uncertainty
• Added support for inhomogeneous uncertainty of br_geometric and br_spherical
• Use tilde to indicate non-breaking space (universal number group separator)
• Use "J" in file extension to indicate energy spectral density per frequency
• Bug fixes

Database:

• Added new database JSON5 file for Deep Sky Objects
• Added spectra for galaxy bulges, galactic cirri, elliptical/spiral/starburst galaxies
• Added photometry of LDN 1642 and nebula of IRC +10216
• Added more optical pulsars
• Added AU Microscopii and its debris disk
• Added Earth photometry from Robinson et al. 2025
• Added spectra of ice and soil at Phoenix landing site
• Added Jupiter Trojan color classes
• Added phase integrals for Titan and Vesta
• Added Neptunian Northern Dark Spot (2018)
• Added Haumean ring model spectra
• Added red spots of Nix and Haumea
• Added Mahlke 2022 and distant object taxonomies
• Added photometry measurement series of 3I/ATLAS
• Added spectra of some comets from BAA Spectroscopy Database
• Added/updated various comets, centaurs and TNOs (dozens)
• Updated albedo and spectra of Io and Europa
• Updated rings of Jupiter and Saturn
• Updated names of minor bodies (Aya, Ritona, Achlys, Máni, Chiminigagua)
• Consistency with recent Celestia content updates



v4.1.0

General:

• Fixed plots collapsing
• Fixed FITS loading
• Fixed bug with Hapke model
• Added file to change window title

Database:

• Added variable star Mira, 4942 Munroe, 33434 Scottmanley, 60558 Echeclus, 65489 Ceto and Phorcys, 474640 Alicanto, 594913 ’Ayló’chaxnim, 2013 LU28, 2013 RF98, 2014 YY49, 2015 BQ311, 2024 YR4 (!!!)
• Updated Galilean moons, Portia, Proteus, Triton, 4 Vesta, 31 Euphrosyne, 121 Hermione, 269 Justitia, 90377 Sedna, 120347 Salacia and Actaea, 134340 Pluto, 136108 Haumea, 1998 KY26, 2002 TX300, 2003 UY117, 2007 OC10, 2010 WG9, 1P/Halley
• Added series of Charon colors, GRS color change by years, set of Saturnian aurorae colors, Ceres locations
• Added first spectra from British Astronomical Association Spectroscopy Database: Venus, Io, Europa
• Added new names & number
• Many fixes

v4.0.0

Core and data processing:

• New spectral reconstruction method, based on Tikhonov regularization (its uncertainty is not scaled properly yet)
• Refactoring of phase functions: storage in classes, ability to call as a function of phase angle
• Added support for 3 new phase functions: phase coefficient, sum of exponentials, and Hapke model
• Refactoring of operators: standard deviation handling everywhere
• Database syntax update to make logical key names more intuitive
• Added is_emission_spectrum key to support spectral lines
• Fixed non-uniform grid importer (maximum inaccuracy of Vega zero points reduced from 6% to 3.5% compared to SVO FPS)
• Added handling of uncertainty and NaN values for the grid importer
• Added uncertainty handling for spectral slopes
• Added extrapolation uncertainty (not correct yet)
• Added support for spectra/indices with inhomogeneous uncertainties
• Fixed calculation of color index standard deviations
• Fixed CALSPEC spectra import

Database:

• Added Larissa, Nix, Hydra, Hi‘iaka, Namaka, 2I/Borisov and PSR B0540–69
• Added photospectra of Pluto and Charon regions
• Added new (photo)spectra of the Moon (still no good one)
• Added Jupiter and Saturn rings spectra
• Added Iapetus leading/trailing hemispheres
• Added 16 new (photo)spectra of Saturnian moons
• Added 8 photospectra of Neptunian irregular moons
• Added 18 new photospectra of Jupiter trojans
• Added 2019 UO14, a Saturn trojan
• Added 18 photospectra of Neptune trojans
• Added new photospectra for ~37 comets, ~121 centaurs and TNOs
• Added ~29 new (photo)spectra of asteroids (mostly active or spacecraft targets)
• Added photometry of centaur population, Damocloids and Jupiter family
• Revision of asteroid spectral types
• Added "active asteroid", "Damocloid", "Jupiter family comet" and "Encke-type comet" categories
• Removed "traced spectrum" category
• Category fixes for many objects
• Added/fixed uncertainties for many objects
• Albedo/phase integrals/phase functions added to most objects
• Added 46 new filters (137 → 183)
• Deleted duplicate dwarf planet spectra files

Object names:

• Parsing and formatting provisional designations
• Fixed comet designations parsing
• "Info" part of object name is now translatable
• Complete Russian translation of object names
• If translated name is the same as the English name, it can be skipped (removes most of the German "translation")
• Fixes and improvements in the recursive line splitter
• Reference names that are too long are displayed in the table with an ellipsis
• Added unit tests for parsing and translating, more unit tests for recursive line splitter

GUI:

• Displaying uncertainty of synthetic photometry with sigfig
• Error bars plotting fixed
• 1σ confidence band plotting
• Fixed HTML color code overexposing
• Fixed albedo note translation bug
• Segoe UI set as default GUI font for Windows to display subscript numbers correctly

v3.4.0

General:

• Image processing in chunks to avoid RAM overflow
• Chunks are represented with new classes, SpectralSquare and PhotoSpectralSquare
• sRGB mode is now the default for consistency with future updates
• In GUI, in an albedo mode with no albedo data, the chromaticity would be displayed, with a note
• In a table, in the same case, the square edge is colored with chromaticity, with a note
• Bug fixes (line splitter, tag list update after reload, etc.)

Database syntax:

• Uncertainty for the br and mag can be specified inline, not only via the sd
• Support for the percent_per_100nm parameter of slope
• Support for asymmetric standard deviations

Database:

• Added 27 new database units in total
• Uranian system updates, Proteus and Triton photometry
• 2003 UZ413, 2005 UQ513, 2014 NW65, Dziewanna, Ascanios and some Haumea family members
• Added Vela pulsar and one more 'Oumuamua photometry

v3.3.0

General:

• Total core refactoring (uniform code for data and image processing)
• Unit tests for the core (testTCT.py)
• Color matching functions can be selected as filters
• sRGB processing mode support for images

GUI:

• The settings visibility depends on their applicability to the current tab
• Tooltips for some settings
• German localization reviewed
• Bug fixes and improvements

Database:

• Added subdwarf and brown dwarf spectra
• Added photometry for Hyperion
• Spectra of Ixion, Quaoar and Orcus extracted directly from the paper PDFs
• Other small changes

There is a known issue with brightness of the plotted star spectra, and a long-standing Windows-specific issue where switching to the "Image processing" tab irreversibly shrinks the window.

v3.3.0-beta1

Bug fixing. sRGB for images

v3.2.1

There was an issue with the previous compiled version, upgrading PyInstaller fixed it; meanwhile there was a minor fix to the source code so this gets a new version number!

v3.2.0

First release posted to the main repository instead of the fork; somehow the version number is already 3.2.0...

General:

• Dynamically updating plot window
• "Evaluate" an equation over the image inputs
• New tag system
• Refactoring of object name processing (in the OOP paradigm)
• Color table design updates
• Light theme for the plot
• Faster gamma correction
• New algorithm for handling color index uncertainty
• Bug fixes and improvements

Database:

• New naming and tagging standards applied
• Added 2014 UZ224, 67P/Churyumov-Gerasimenko and 103P/Hartley 2
• Traced spectra for Ixion, Quaoar and Orcus
• Added albedo for Chaos, Lempo and Hale–Bopp
• Added phase integral for Arawn
• Updated albedos for Phobos and Deimos