BREATHING COMETS

Small-Body Lab

Thermal sizes after NEOWISE. Every estimate keeps its uncertainty, evidence tier and observing limits attached.

11 tier A · 17 tier B · 6 provisional · 7 potentially hazardous in A/B

Diameter versus absolute magnitude

0.010.1110171819202122232026 HB9 · 0.788 [0.485–0.971] km · A2025 YH5 · 0.949 [0.61–1.363] km · A2025 GM1 · 0.424 [0.271–0.55] km · A2025 RW4 · 0.549 [0.412–0.755] km · A2024 WC15 · 0.293 [0.228–0.409] km · A2026 CW4 · 1.1 [0.747–1.424] km · A2026 FP12 · 0.793 [0.53–0.929] km · A2025 UU3 · 0.256 [0.184–0.327] km · A2025 XF · 0.288 [0.213–0.414] km · A2025 TG4 · 0.168 [0.122–0.218] km · A2025 RY1 · 0.135 [0.106–0.173] km · A2025 HA2 · 0.233 [0.162–0.319] km · B2026 RD51 · 0.177 [0.125–0.23] km · B2025 QT · 0.296 [0.188–0.393] km · B2025 FR5 · 0.224 [0.164–0.298] km · B2025 OZ12 · 0.176 [0.137–0.223] km · B2025 FV23 · 0.133 [0.101–0.182] km · B2026 FU6 · 0.15 [0.109–0.197] km · B2025 QF11 · 0.219 [0.146–0.254] km · B2025 UZ4 · 0.209 [0.168–0.283] km · B2026 JV4 · 0.23 [0.173–0.32] km · B2026 OH3 · 0.19 [0.141–0.263] km · B2025 SG81 · 0.334 [0.242–0.471] km · B2025 QU7 · 0.331 [0.243–0.481] km · B2025 WC14 · 0.125 [0.091–0.159] km · B2025 ST20 · 0.092 [0.076–0.118] km · B2026 RV3 · 0.382 [0.269–0.498] km · B2026 JO3 · 0.346 [0.235–0.476] km · B2025 YK9 · 0.311 [0.257–0.404] km · provisional2025 OD15 · 0.648 [0.419–0.873] km · provisional2026 LJ2 · 1.717 [1.043–2.301] km · provisional2026 JL4 · 0.585 [0.395–0.759] km · provisional2025 FV2 · 0.619 [0.401–0.821] km · provisional2026 GE2 · 0.493 [0.38–0.668] km · provisionalH (mag)D (km)

Assumed albedo reference lines: pV = 0.04 · pV = 0.14 · pV = 0.40

Vertical bars: published 16–84% intervals. Open points: provisional. Reference curves assume the labelled albedos; they are not measurements.

Measured, then checked

Out-of-sample dispersion: −33%/+36% across 50 NEOWISE objects. The fitted median is not an accuracy measure.

0.11100.1110152679: NEOWISE 4.4295 km; SPHEREx 5.612 km2011 LA19: NEOWISE 0.852 km; SPHEREx 0.9074 km35107: NEOWISE 0.929 km; SPHEREx 1.076 km5863: NEOWISE 1.345 km; SPHEREx 2.713 km11398: NEOWISE 1.316 km; SPHEREx 1.824 kmD_NEOWISE (km)D_SPHEREx (km)

Absolute reference diameters are retained for 5 of 50 validation objects. The plot shows only those pairs; all published validation ratios remain available below. Full reference retrieval is pending.

All validation ratios
ObjectD_SPHEREx / D_NEOWISE
1621421.091
1624631.055
1625661.605
1629982.085
2015 XD1301.182
2426430.674
3120700.621
3150980.968
3499251.152
402631.194
4694941.220
4924781.188
51430.700
56040.569
1526791.267
1620800.872
2014 JH571.314
21000.879
40551.140
887100.910
1370840.844
168340.487
2010 VD721.667
2011 LA191.065
2254160.984
351071.158
41831.353
4339530.679
4339921.125
662510.662
115000.502
1633480.833
1901611.132
2005 CR370.719
2010 KY390.722
2015 OS351.393
2564120.972
2639760.540
58632.017
857090.654
898300.797
113981.386
1632430.593
1641210.779
1942681.695
2014 HQ1241.094
2015 FD3410.689
210881.465
3074930.895
3317921.339

Diameter catalog

Systematic floor: ±35% per object

ObjectDiameter16–84% intervalEvidence tierH / pV
0.788 km±35%0.485–0.971 kmA20.64 / 0.016
PHASingle visit0.949 km±35%0.610–1.363 kmA19.77 / 0.024
0.424 km±35%0.271–0.550 kmA20.11 / 0.089
0.549 km±35%0.412–0.755 kmA19.29 / 0.113
PHA0.293 km±35%0.228–0.409 kmA20.91 / 0.089
1.100 km±35%0.747–1.424 kmA19.74 / 0.019
0.793 km±35%0.530–0.929 kmA18.63 / 0.099
0.256 km±35%0.184–0.327 kmA20.06 / 0.254
Single visit0.288 km±35%0.213–0.414 kmA20.83 / 0.099
0.168 km±35%0.122–0.218 kmA21.64 / 0.139
0.135 km±35%0.106–0.173 kmA21.95 / 0.162
0.233 km±35%0.162–0.319 kmB20.58 / 0.190
0.177 km±35%0.125–0.230 kmB20.85 / 0.256
Single visit0.296 km±35%0.188–0.393 kmB20.50 / 0.127
PHA0.224 km±35%0.164–0.298 kmB20.36 / 0.252
0.176 km±35%0.137–0.223 kmB20.52 / 0.353
0.133 km±35%0.101–0.182 kmB21.82 / 0.185
0.150 km±35%0.109–0.197 kmB21.44 / 0.208
0.219 km±35%0.146–0.254 kmB20.71 / 0.192
Single visit0.209 km±35%0.168–0.283 kmB19.85 / 0.463
0.230 km±35%0.173–0.320 kmB20.00 / 0.334
PHA0.190 km±35%0.141–0.263 kmB21.36 / 0.140
0.334 km±35%0.242–0.471 kmB19.63 / 0.222
Single visit0.331 km±35%0.243–0.481 kmB19.93 / 0.172
PHA0.125 km±35%0.091–0.159 kmB21.74 / 0.227
PHA0.092 km±35%0.076–0.118 kmB21.67 / 0.451
Single visit0.382 km±35%0.269–0.498 kmB19.89 / 0.134
PHA0.346 km±35%0.235–0.476 kmB19.87 / 0.166
0.311 km±35%0.257–0.404 kmProvisional18.79 / 0.558
0.648 km±35%0.419–0.873 kmProvisional20.90 / 0.018
Single visit1.717 km±35%1.043–2.301 kmProvisional18.89 / 0.017
0.585 km±35%0.395–0.759 kmProvisional18.95 / 0.136
0.619 km±35%0.401–0.821 kmProvisional21.10 / 0.017
Single visit0.493 km±35%0.380–0.668 kmProvisional20.10 / 0.066

Retained photometry

Select an object to inspect its retained photometry.

Method and limits

NEATM + reflected (HG, G=0.15), eps=0.9. η = 1.48 ± 0.44; only trails ≤ 3 px. Diameters and intervals are the published results, not fits made by this page. The systematic floor is additional to the tabulated interval. Albedo depends on H and the thermal diameter.

ePSF forced (sampled), trailed, same-λ sky from other visits

NEOWISE reference catalog · Download catalog JSON
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