C/2009 P2 (Boattini)

Metadata

Parameter Value
Designation C/2009 P2 (Boattini)
Type C
Perihelion (tp_cal, UTC) 2010-02-10T12:15:33.076800Z
Orbit solution date (soln_date, UTC) 2021-04-15T23:31:33Z
Obs used 507
NEO -
M1 11.400
K1 4.500
PC -
Osculating Elements
Parameter Value
Epoch (epoch_cal, TDB) 2009-12-14.0000000
e 1.00153878
q (au) 6.543973
a (au) -4252.703414
i (deg) 163.452939
Ω (om, deg) 60.364967
ω (w, deg) 76.032402
M (ma, deg) -0.000208

Magnitude

C/2009 P2 (Boattini) · Magnitude (Full range)

Scatter + Global Linear

$$ M_a = (5.288 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

Model Parameters

Parameter Value
H0 5.288
n 6.000
gf 0.973
gb -0.687
k 0.800
δ90 9.996
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)
2026-03-26 00:00 14:26:55.06 -20:57:11.3 HIP 70765 30.32
2026-03-26 12:00 14:26:51.23 -20:56:59.1 HIP 70765 30.75
2026-03-27 00:00 14:26:47.38 -20:56:46.8 HIP 70765 31.20
2026-03-27 12:00 14:26:43.52 -20:56:34.3 HIP 70765 31.67
2026-03-28 00:00 14:26:39.63 -20:56:21.7 HIP 70535 32.05
2026-03-28 12:00 14:26:35.73 -20:56:08.9 HIP 70482 31.87
2026-03-29 00:00 14:26:31.81 -20:55:56.0 HIP 70482 31.07
2026-03-29 12:00 14:26:27.87 -20:55:42.9 HIP 70482 30.28
2026-03-30 00:00 14:26:23.91 -20:55:29.7 HIP 70482 29.50
2026-03-30 12:00 14:26:19.93 -20:55:16.4 HIP 70482 28.72
2026-03-31 00:00 14:26:15.94 -20:55:02.9 HIP 70482 27.95
2026-03-31 12:00 14:26:11.93 -20:54:49.3 HIP 70482 27.19
2026-04-01 00:00 14:26:07.90 -20:54:35.6 HIP 70482 26.43
2026-04-01 12:00 14:26:03.85 -20:54:21.7 HIP 70482 25.68
2026-04-02 00:00 14:25:59.79 -20:54:07.7 HIP 70482 24.95
2026-04-02 12:00 14:25:55.72 -20:53:53.6 HIP 70482 24.23
2026-04-03 00:00 14:25:51.62 -20:53:39.3 HIP 70482 23.53
2026-04-03 12:00 14:25:47.52 -20:53:24.9 HIP 70482 22.84
2026-04-04 00:00 14:25:43.39 -20:53:10.4 HIP 70482 22.17
2026-04-04 12:00 14:25:39.25 -20:52:55.7 HIP 70482 21.52
2026-04-05 00:00 14:25:35.10 -20:52:40.9 HIP 70482 20.90
2026-04-05 12:00 14:25:30.93 -20:52:26.0 HIP 70482 20.30
2026-04-06 00:00 14:25:26.75 -20:52:11.0 HIP 70482 19.74
2026-04-06 12:00 14:25:22.56 -20:51:55.8 HIP 70482 19.21
2026-04-07 00:00 14:25:18.35 -20:51:40.5 HIP 70482 18.71
2026-04-07 12:00 14:25:14.13 -20:51:25.1 HIP 70482 18.26
2026-04-08 00:00 14:25:09.89 -20:51:09.5 HIP 70482 17.85
2026-04-08 12:00 14:25:05.64 -20:50:53.9 HIP 70482 17.49
2026-04-09 00:00 14:25:01.38 -20:50:38.1 HIP 70482 17.18
2026-04-09 12:00 14:24:57.11 -20:50:22.2 HIP 70482 16.92
2026-04-10 00:00 14:24:52.83 -20:50:06.2 HIP 70482 16.73
2026-04-10 12:00 14:24:48.53 -20:49:50.1 HIP 70482 16.59
2026-04-11 00:00 14:24:44.23 -20:49:33.8 HIP 70482 16.52
2026-04-11 12:00 14:24:39.91 -20:49:17.5 HIP 70482 16.51
2026-04-12 00:00 14:24:35.59 -20:49:01.0 HIP 70482 16.57
2026-04-12 12:00 14:24:31.25 -20:48:44.5 HIP 70482 16.69
2026-04-13 00:00 14:24:26.90 -20:48:27.8 HIP 70482 16.88
2026-04-13 12:00 14:24:22.54 -20:48:11.0 HIP 70482 17.13
2026-04-14 00:00 14:24:18.18 -20:47:54.1 HIP 70482 17.44
2026-04-14 12:00 14:24:13.80 -20:47:37.1 HIP 70482 17.81
2026-04-15 00:00 14:24:09.42 -20:47:19.9 HIP 70482 18.23
2026-04-15 12:00 14:24:05.03 -20:47:02.7 HIP 70482 18.71
2026-04-16 00:00 14:24:00.63 -20:46:45.4 HIP 70482 19.23