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