C/2011 Y3 (Boattini)

Metadata

Parameter Value
Designation C/2011 Y3 (Boattini)
Type C
Perihelion (tp_cal, UTC) 2011-08-22T22:31:41.001600Z
Orbit solution date (soln_date, UTC) 2021-04-15T23:31:59Z
Obs used 54
NEO -
M1 11.700
K1 10.000
PC 0.030
Osculating Elements
Parameter Value
Epoch (epoch_cal, TDB) 2012-01-01.0000000
e 0.70491483
q (au) 3.497843
a (au) 11.853673
i (deg) 26.516854
Ω (om, deg) 84.802605
ω (w, deg) 340.679907
M (ma, deg) 3.165186

Magnitude

C/2011 Y3 (Boattini) · Magnitude (Full range)

Scatter + Global Linear

$$ M_a = (14.177 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

Model Parameters

Parameter Value
H0 14.177
n 2.000
gf 0.997
gb -0.953
k 1.000
δ90 6.973
Parameter Symbol Range Description
Absolute magnitude at 1 AU from Sun and Earth H0 -5 to 20 Intrinsic brightness of the comet
Photometric slope parameter n 2 to 6 Rate of brightness change with heliocentric distance
Forward scattering asymmetry factor gf 0.8 to 1 Degree of forward scattering
Backward scattering asymmetry factor gb -1 to -0.5 Degree of backward scattering
Partitioning coefficient k 0.8 to 1 Ratio between forward/backward scattering contributions
Dust-to-gas brightness ratio δ90 1 to 10 Relative contribution of dust scattering to gas emission

Reference: EPSC-DPS2025-160

Ephemeris

Date/Time (UTC) RA (J2000) Dec (J2000) Nearest HIP Dist from HIP (arcmin)
2026-09-20 00:00 15:39:21.63 -06:15:30.7 HIP 76616 9.56
2026-09-20 12:00 15:39:25.28 -06:16:05.6 HIP 76616 10.23
2026-09-21 00:00 15:39:28.97 -06:16:40.5 HIP 76616 10.97
2026-09-21 12:00 15:39:32.69 -06:17:15.5 HIP 76616 11.77
2026-09-22 00:00 15:39:36.46 -06:17:50.4 HIP 76616 12.63
2026-09-22 12:00 15:39:40.27 -06:18:25.4 HIP 76616 13.53
2026-09-23 00:00 15:39:44.12 -06:19:00.4 HIP 76616 14.48
2026-09-23 12:00 15:39:48.01 -06:19:35.4 HIP 76616 15.45
2026-09-24 00:00 15:39:51.93 -06:20:10.5 HIP 76616 16.46
2026-09-24 12:00 15:39:55.90 -06:20:45.6 HIP 76616 17.49
2026-09-25 00:00 15:39:59.91 -06:21:20.6 HIP 76616 18.54
2026-09-25 12:00 15:40:03.95 -06:21:55.7 HIP 76616 19.62
2026-09-26 00:00 15:40:08.03 -06:22:30.9 HIP 76616 20.71
2026-09-26 12:00 15:40:12.15 -06:23:06.0 HIP 76616 21.82
2026-09-27 00:00 15:40:16.31 -06:23:41.1 HIP 76865 22.33
2026-09-27 12:00 15:40:20.51 -06:24:16.3 HIP 76865 21.23
2026-09-28 00:00 15:40:24.74 -06:24:51.4 HIP 76865 20.12
2026-09-28 12:00 15:40:29.01 -06:25:26.6 HIP 76865 19.02
2026-09-29 00:00 15:40:33.32 -06:26:01.7 HIP 76865 17.92
2026-09-29 12:00 15:40:37.66 -06:26:36.9 HIP 76865 16.83
2026-09-30 00:00 15:40:42.04 -06:27:12.0 HIP 76865 15.75
2026-09-30 12:00 15:40:46.46 -06:27:47.2 HIP 76865 14.68
2026-10-01 00:00 15:40:50.91 -06:28:22.3 HIP 76865 13.64
2026-10-01 12:00 15:40:55.40 -06:28:57.5 HIP 76865 12.63
2026-10-02 00:00 15:40:59.92 -06:29:32.6 HIP 76865 11.66
2026-10-02 12:00 15:41:04.48 -06:30:07.7 HIP 76865 10.74
2026-10-03 00:00 15:41:09.08 -06:30:42.8 HIP 76865 9.89
2026-10-03 12:00 15:41:13.71 -06:31:17.9 HIP 76865 9.14
2026-10-04 00:00 15:41:18.37 -06:31:53.0 HIP 76865 8.50
2026-10-04 12:00 15:41:23.07 -06:32:28.1 HIP 76865 8.03
2026-10-05 00:00 15:41:27.81 -06:33:03.2 HIP 76865 7.74
2026-10-05 12:00 15:41:32.57 -06:33:38.2 HIP 76865 7.67
2026-10-06 00:00 15:41:37.37 -06:34:13.2 HIP 76865 7.81
2026-10-06 12:00 15:41:42.21 -06:34:48.2 HIP 76865 8.18
2026-10-07 00:00 15:41:47.07 -06:35:23.1 HIP 76865 8.73
2026-10-07 12:00 15:41:51.97 -06:35:58.0 HIP 76865 9.45
2026-10-08 00:00 15:41:56.91 -06:36:32.9 HIP 76865 10.29
2026-10-08 12:00 15:42:01.87 -06:37:07.8 HIP 76865 11.24
2026-10-09 00:00 15:42:06.87 -06:37:42.6 HIP 76865 12.27
2026-10-09 12:00 15:42:11.90 -06:38:17.4 HIP 76865 13.36
2026-10-10 00:00 15:42:16.95 -06:38:52.2 HIP 76865 14.51
2026-10-10 12:00 15:42:22.04 -06:39:26.9 HIP 76865 15.69
2026-10-11 00:00 15:42:27.17 -06:40:01.6 HIP 76865 16.92