C/2009 P2 (Boattini)
| 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
Scatter + Global Linear
$$
M_a = (5.292 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.292 |
| n |
6.000 |
| gf |
0.996 |
| gb |
-0.687 |
| k |
0.800 |
| δ90 |
9.999 |
| 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) |
| 2026-02-03 00:00 |
14:31:00.91 |
-21:03:33.4 |
HIP 71071 |
15.79 |
| 2026-02-03 12:00 |
14:31:00.15 |
-21:03:38.2 |
HIP 71071 |
15.99 |
| 2026-02-04 00:00 |
14:30:59.35 |
-21:03:42.8 |
HIP 71071 |
16.19 |
| 2026-02-04 12:00 |
14:30:58.52 |
-21:03:47.3 |
HIP 71071 |
16.39 |
| 2026-02-05 00:00 |
14:30:57.65 |
-21:03:51.6 |
HIP 71071 |
16.61 |
| 2026-02-05 12:00 |
14:30:56.75 |
-21:03:55.8 |
HIP 71071 |
16.83 |
| 2026-02-06 00:00 |
14:30:55.81 |
-21:03:59.8 |
HIP 71071 |
17.05 |
| 2026-02-06 12:00 |
14:30:54.84 |
-21:04:03.6 |
HIP 71071 |
17.29 |
| 2026-02-07 00:00 |
14:30:53.83 |
-21:04:07.3 |
HIP 71071 |
17.53 |
| 2026-02-07 12:00 |
14:30:52.79 |
-21:04:10.8 |
HIP 71071 |
17.77 |
| 2026-02-08 00:00 |
14:30:51.71 |
-21:04:14.1 |
HIP 71071 |
18.02 |
| 2026-02-08 12:00 |
14:30:50.60 |
-21:04:17.3 |
HIP 71071 |
18.28 |
| 2026-02-09 00:00 |
14:30:49.45 |
-21:04:20.3 |
HIP 71071 |
18.55 |
| 2026-02-09 12:00 |
14:30:48.27 |
-21:04:23.1 |
HIP 71071 |
18.82 |
| 2026-02-10 00:00 |
14:30:47.05 |
-21:04:25.7 |
HIP 71071 |
19.10 |
| 2026-02-10 12:00 |
14:30:45.80 |
-21:04:28.2 |
HIP 71071 |
19.38 |
| 2026-02-11 00:00 |
14:30:44.51 |
-21:04:30.5 |
HIP 71071 |
19.67 |
| 2026-02-11 12:00 |
14:30:43.19 |
-21:04:32.7 |
HIP 71071 |
19.97 |
| 2026-02-12 00:00 |
14:30:41.83 |
-21:04:34.7 |
HIP 71071 |
20.28 |
| 2026-02-12 12:00 |
14:30:40.44 |
-21:04:36.5 |
HIP 71071 |
20.59 |
| 2026-02-13 00:00 |
14:30:39.01 |
-21:04:38.1 |
HIP 71071 |
20.91 |
| 2026-02-13 12:00 |
14:30:37.55 |
-21:04:39.6 |
HIP 71071 |
21.24 |
| 2026-02-14 00:00 |
14:30:36.05 |
-21:04:40.9 |
HIP 71071 |
21.57 |
| 2026-02-14 12:00 |
14:30:34.52 |
-21:04:42.0 |
HIP 71071 |
21.91 |
| 2026-02-15 00:00 |
14:30:32.95 |
-21:04:43.0 |
HIP 70961 |
22.07 |
| 2026-02-15 12:00 |
14:30:31.35 |
-21:04:43.7 |
HIP 70961 |
22.16 |
| 2026-02-16 00:00 |
14:30:29.72 |
-21:04:44.3 |
HIP 70961 |
22.26 |
| 2026-02-16 12:00 |
14:30:28.05 |
-21:04:44.8 |
HIP 70961 |
22.36 |
| 2026-02-17 00:00 |
14:30:26.34 |
-21:04:45.0 |
HIP 70961 |
22.47 |
| 2026-02-17 12:00 |
14:30:24.60 |
-21:04:45.1 |
HIP 70961 |
22.58 |
| 2026-02-18 00:00 |
14:30:22.83 |
-21:04:45.0 |
HIP 70961 |
22.70 |
| 2026-02-18 12:00 |
14:30:21.03 |
-21:04:44.8 |
HIP 70961 |
22.82 |
| 2026-02-19 00:00 |
14:30:19.19 |
-21:04:44.3 |
HIP 70961 |
22.96 |
| 2026-02-19 12:00 |
14:30:17.31 |
-21:04:43.7 |
HIP 70961 |
23.10 |
| 2026-02-20 00:00 |
14:30:15.40 |
-21:04:42.9 |
HIP 70961 |
23.24 |
| 2026-02-20 12:00 |
14:30:13.46 |
-21:04:42.0 |
HIP 70961 |
23.40 |
| 2026-02-21 00:00 |
14:30:11.48 |
-21:04:40.8 |
HIP 70961 |
23.56 |
| 2026-02-21 12:00 |
14:30:09.48 |
-21:04:39.5 |
HIP 70961 |
23.74 |
| 2026-02-22 00:00 |
14:30:07.43 |
-21:04:38.1 |
HIP 70961 |
23.92 |
| 2026-02-22 12:00 |
14:30:05.36 |
-21:04:36.4 |
HIP 70961 |
24.11 |
| 2026-02-23 00:00 |
14:30:03.25 |
-21:04:34.6 |
HIP 70961 |
24.31 |
| 2026-02-23 12:00 |
14:30:01.11 |
-21:04:32.6 |
HIP 70961 |
24.51 |
| 2026-02-24 00:00 |
14:29:58.94 |
-21:04:30.4 |
HIP 70961 |
24.73 |