29P/Schwassmann-Wachmann
29P is a centaur-like comet that is active far from the Sun: its CO₂ census value comes from a single visit sweep in December 2025.
Real SPHEREx frames, centred on the comet
Each frame is one exposure at one wavelength, tracked on the comet with the JPL Horizons ephemeris and shown with the stack's common stretch. No continuum is subtracted and no gas map is made: where the CO₂ band is bright you see it as a brighter, larger coma only in the frames marked “in band”.
Spectrum around the CO₂ band
D5, sky subtracted, 3 px aperture, window 3.85–4.42 µm. One point per exposure.
Wavelength (µm) / Flux (mJy)
| µm | mJy | σ |
|---|---|---|
| 3.8726 | 5.266 | 0.218 |
| 3.8851 | 4.959 | 0.221 |
| 3.9065 | 5.029 | 0.223 |
| 3.9189 | 5.057 | 0.224 |
| 3.9414 | 4.777 | 0.217 |
| 3.9527 | 4.709 | 0.231 |
| 3.9750 | 4.524 | 0.240 |
| 3.9874 | 4.592 | 0.218 |
| 4.0164 | 4.567 | 0.209 |
| 4.0276 | 3.930 | 0.210 |
| 4.0517 | 4.808 | 0.217 |
| 4.0634 | 3.950 | 0.209 |
| 4.0872 | 5.028 | 0.223 |
| 4.0972 | 3.763 | 0.789 |
| 4.1229 | 4.411 | 0.221 |
| 4.1324 | 3.155 | 0.824 |
| 4.1611 | 4.377 | 0.225 |
| 4.1625 | 4.043 | 0.792 |
| 4.1705 | 3.570 | 0.215 |
| 4.1743 | 4.278 | 0.236 |
| 4.1970 | 5.062 | 0.233 |
| 4.2106 | 6.883 | 0.248 |
| 4.2332 | 15.41 | 0.299 |
| 4.2464 | 16.76 | 0.310 |
| 4.2696 | 15.82 | 0.300 |
| 4.2828 | 6.123 | 0.251 |
| 4.3095 | 4.643 | 0.244 |
| 4.3206 | 3.992 | 0.238 |
| 4.3465 | 4.987 | 0.254 |
| 4.3574 | 4.272 | 0.242 |
| 4.3836 | 4.981 | 0.262 |
| 4.3914 | 4.466 | 0.253 |
Spectrum around the CO window
D6 spectrum used for the CO census; the CO (1–0) band sits at 4.55–4.80 µm.
Wavelength (µm) / Flux (mJy)
| µm | mJy | σ |
|---|---|---|
| 4.4124 | 3.764 | 0.288 |
| 4.4436 | 3.237 | 0.292 |
| 4.4765 | 4.033 | 0.284 |
| 4.5108 | 3.444 | 0.295 |
| 4.5436 | 4.185 | 0.294 |
| 4.5773 | 3.924 | 0.306 |
| 4.6110 | 13.42 | 0.366 |
| 4.6457 | 37.13 | 0.548 |
| 4.6800 | 50.00 | 0.651 |
| 4.7143 | 7.419 | 0.490 |
| 4.7488 | 4.483 | 0.477 |
| 4.7897 | 4.004 | 0.374 |
| 4.7921 | 4.152 | 0.356 |
| 4.8267 | 4.100 | 0.376 |
| 4.8619 | 3.153 | 0.369 |
| 4.8977 | 3.483 | 0.408 |
| 4.9361 | 3.627 | 0.410 |
| 4.9720 | 4.494 | 0.432 |
Numbers behind the result
Status: Detected
Q(CO₂) 1.03 × 10²⁷ [8.29 × 10²⁶–1.27 × 10²⁷] s⁻¹
S/N 20.3 · σ_F/F 0.053 · 3 core channels · χ²ᵣ 9.0 · T_rot 40 K · r_h 6.30 au · Δ 6.20 au
Alternative recipes: 1.14 × 10²⁷ with other τ and g; 6.13 × 10²⁶ with a lower outflow speed.
Q against aperture: 9.27 × 10²⁶ (2 px), 1.00 × 10²⁷ (3 px), 1.26 × 10²⁷ (5 px), 1.61 × 10²⁷ (8 px) s⁻¹. A strong trend means the gas is not a simple parent-molecule coma.
CO: detection; CO/CO₂ 43.8 [36.6–51.9]
Compared with published values
CO · 2025-12: 4.50 × 10²⁸ s⁻¹ ↔ 2.90 × 10²⁸–5.60 × 10²⁸ s⁻¹ (inside the published range)
Bockelee-Morvan et al. 2022 (IRAM, 2.9-5.6e28); quiescent 1.8e28 (Festou et al. 2001)
Provenance
Tracked with JPL Horizons target 90000393 (Horizons id of 29P), observer SPHEREx.
Stack 2025-12 · D5 · 34 frames · 34 shown (≥ 95% valid pixels)
Frames used
2025W51_1A_0329_4 · 2025W51_1A_0385_1 · 2025W51_2A_0133_1 · 2025W51_1A_0385_2 · 2025W51_2A_0133_2 · 2025W51_1A_0385_3 · 2025W51_2A_0133_3 · 2025W51_1A_0385_4 · 2025W51_2A_0133_4 · 2025W51_1A_0636_1 · 2025W51_2A_0498_1 · 2025W51_1A_0636_2 · 2025W51_2A_0498_2 · 2025W51_1A_0636_3 · 2025W51_2A_0383_3 · 2025W51_1A_0636_4 · 2025W51_2A_0383_4 · 2025W51_1A_0274_1 · 2025W51_2A_0051_1 · 2025W51_2A_0541_1 · 2025W51_2A_0023_1 · 2025W51_1A_0274_2 · 2025W51_2A_0023_2 · 2025W51_1A_0274_3 · 2025W51_2A_0023_3 · 2025W51_1A_0274_4 · 2025W51_2A_0023_4 · 2025W51_1A_0413_1 · 2025W51_2A_0104_1 · 2025W51_1A_0413_2 · 2025W51_2A_0104_2 · 2025W51_1A_0413_3 · 2025W51_2A_0104_3 · 2025W51_1A_0413_4
Generated 2026-11-14T18:31Z by pipelines/comet_pages.py
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