Table 1
Stellar properties of TOI-521 and TOI-912.
| Parameter | TOI-521 | TOI-912 | Source |
|---|---|---|---|
| TIC | 27649847 | 406941612 | |
| Gaia DR3 | 649852779797683968 | 5772442647192375808 | |
| 2MASS | J08132251+1213181 | J15172165-8028225 | |
| RA (J2000; hh:mm:ss.ss) | 08:13:22.62 | 15:17:18.76 | A |
| Dec (J2000; dd:mm:ss.ss) | +12:13:19.63 | −80:28:24.09 | A |
| μα (mas yr−1) | 90.415 ± 0.019 | −451.119 ± 0.016 | A |
| μδ (mas yr−1) | 80.780 ± 0.013 | −93.820 ± 0.017 | A |
| Parallax (mas) | 16.388 ± 0.020 | 38.327 ± 0.015 | A |
| Distance (pc) | ![$\[60.84_{-0.08}^{+0.07}\]$](/articles/aa/full_html/2026/01/aa57304-25/aa57304-25-eq4.png) |
![$\[26.089_{-0.009}^{+0.008}\]$](/articles/aa/full_html/2026/01/aa57304-25/aa57304-25-eq5.png) |
B |
| γ (km s−1) | −9.31 ± 1.10 | 10.47 ± 0.31 | A |
| U (km s−1) | 13.47 ± 0.86 | −30.29 ± 0.18 | Fa |
| V (km s−1) | 20.17 ± 0.52 | −46.38 ± 0.23 | Fa |
| W (km s−1) | 26.85 ± 0.44 | 16.98 ± 0.10 | Fa |
| TESS (mag) | 12.403 ± 0.007 | 10.490 ± 0.007 | C |
| G (mag) | 13.568 ± 0.003 | 11.643 ± 0.003 | A |
| GBP (mag) | 14.878 ± 0.004 | 12.928 ± 0.003 | A |
| GRP (mag) | 12.436 ± 0.004 | 10.520 ± 0.004 | A |
| B (mag) | 16.268 ± 0.147 | 14.170 ± 0.018 | C |
| V (mag) | 14.691 ± 0.066 | 12.670 ± 0.048 | C |
| J (mag) | 10.921 ± 0.022 | 9.089 ± 0.023 | D |
| H (mag) | 10.357 ± 0.020 | 8.468 ± 0.040 | D |
| K (mag) | 10.089 ± 0.0191 | 8.204 ± 0.023 | D |
| W1 (mag) | 9.985 ± 0.023 | 8.033 ± 0.024 | E |
| W2 (mag) | 9.854 ± 0.021 | 7.943 ± 0.021 | E |
| W3 (mag) | 9.727 ± 0.0474 | 7.831 ± 0.018 | E |
| W4 (mag) | >9.006 | 7.630 ± 0.113 | E |
| Teff (K) | 3544 ± 100 | 3572 ± 100 | F |
| log g (cgs) | 4.97 ± 0.10 | 4.98 ± 0.09 | F, Spectroscopic |
| log g (cgs) | 4.81 ± 0.09 | 4.82 ± 0.09 | F, Bolometric |
| [Fe/H] (dex) | −0.12 ± 0.08 | −0.19 ± 0.07 | F |
![$\[\log~ \mathrm{R}_{\mathrm{HK}}^{\prime}\]$](/articles/aa/full_html/2026/01/aa57304-25/aa57304-25-eq6.png) |
−5.500 ± 0.036 | −5.176 ± 0.011 | F |
| Prot (d) | − | ![$\[45.9_{-0.2}^{+0.6}\]$](/articles/aa/full_html/2026/01/aa57304-25/aa57304-25-eq7.png) |
F |
| R⋆ (R⊙) | 0.421 ± 0.028 | 0.419 ± 0.028 | F |
| M⋆ (M⊙) | 0.420 ± 0.030 | 0.418 ± 0.030 | F |
| L⋆ (L⊙) | 0.0252 ± 0.0005 | 0.0257 ± 0.0006 | F |
| Spectral type | M3 | M3 | F |
| Age (Gyr) | >0.8 | >0.8 | F |
Notes. A) Gaia DR3 (Gaia Collaboration 2023). B) Bailer-Jones et al. (2021). C) TESS Input Catalogue Version 8 (TICv8, Stassun et al. 2018). D) Two Micron All Sky Survey (2MASS, Cutri et al. 2003). E) Wide-field Infrared Survey Explorer (AllWISE; Cutri et al. 2021). F) This work. (a)Kinematic velocity components adopting a right-handed, heliocentric Galactic system.
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