| 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) |
| 2026-05-12 00:00 |
14:20:09.37 |
-20:30:02.8 |
HIP 70033 |
22.96 |
| 2026-05-12 12:00 |
14:20:05.02 |
-20:29:42.3 |
HIP 70033 |
23.11 |
| 2026-05-13 00:00 |
14:20:00.69 |
-20:29:21.8 |
HIP 70033 |
23.30 |
| 2026-05-13 12:00 |
14:19:56.36 |
-20:29:01.2 |
HIP 70033 |
23.54 |
| 2026-05-14 00:00 |
14:19:52.04 |
-20:28:40.6 |
HIP 70033 |
23.83 |
| 2026-05-14 12:00 |
14:19:47.74 |
-20:28:20.0 |
HIP 70033 |
24.16 |
| 2026-05-15 00:00 |
14:19:43.44 |
-20:27:59.4 |
HIP 70033 |
24.53 |
| 2026-05-15 12:00 |
14:19:39.16 |
-20:27:38.8 |
HIP 70033 |
24.94 |
| 2026-05-16 00:00 |
14:19:34.89 |
-20:27:18.2 |
HIP 70033 |
25.39 |
| 2026-05-16 12:00 |
14:19:30.63 |
-20:26:57.6 |
HIP 70033 |
25.87 |
| 2026-05-17 00:00 |
14:19:26.38 |
-20:26:37.0 |
HIP 70033 |
26.39 |
| 2026-05-17 12:00 |
14:19:22.14 |
-20:26:16.3 |
HIP 70033 |
26.94 |
| 2026-05-18 00:00 |
14:19:17.92 |
-20:25:55.7 |
HIP 70033 |
27.51 |
| 2026-05-18 12:00 |
14:19:13.70 |
-20:25:35.1 |
HIP 70033 |
28.11 |
| 2026-05-19 00:00 |
14:19:09.51 |
-20:25:14.5 |
HIP 70033 |
28.74 |
| 2026-05-19 12:00 |
14:19:05.32 |
-20:24:53.8 |
HIP 69844 |
28.72 |
| 2026-05-20 00:00 |
14:19:01.15 |
-20:24:33.2 |
HIP 69844 |
28.30 |
| 2026-05-20 12:00 |
14:18:56.99 |
-20:24:12.6 |
HIP 69844 |
27.91 |
| 2026-05-21 00:00 |
14:18:52.85 |
-20:23:52.0 |
HIP 69844 |
27.55 |
| 2026-05-21 12:00 |
14:18:48.72 |
-20:23:31.4 |
HIP 69844 |
27.23 |
| 2026-05-22 00:00 |
14:18:44.61 |
-20:23:10.9 |
HIP 69844 |
26.95 |
| 2026-05-22 12:00 |
14:18:40.51 |
-20:22:50.3 |
HIP 69844 |
26.70 |
| 2026-05-23 00:00 |
14:18:36.43 |
-20:22:29.8 |
HIP 69844 |
26.50 |
| 2026-05-23 12:00 |
14:18:32.37 |
-20:22:09.2 |
HIP 69844 |
26.33 |
| 2026-05-24 00:00 |
14:18:28.32 |
-20:21:48.7 |
HIP 69844 |
26.20 |
| 2026-05-24 12:00 |
14:18:24.28 |
-20:21:28.2 |
HIP 69844 |
26.12 |
| 2026-05-25 00:00 |
14:18:20.27 |
-20:21:07.8 |
HIP 69844 |
26.07 |
| 2026-05-25 12:00 |
14:18:16.26 |
-20:20:47.4 |
HIP 69828 |
25.64 |
| 2026-05-26 00:00 |
14:18:12.28 |
-20:20:26.9 |
HIP 69828 |
24.93 |
| 2026-05-26 12:00 |
14:18:08.31 |
-20:20:06.6 |
HIP 69828 |
24.24 |
| 2026-05-27 00:00 |
14:18:04.37 |
-20:19:46.2 |
HIP 69828 |
23.57 |
| 2026-05-27 12:00 |
14:18:00.43 |
-20:19:25.9 |
HIP 69828 |
22.93 |
| 2026-05-28 00:00 |
14:17:56.52 |
-20:19:05.6 |
HIP 69828 |
22.32 |
| 2026-05-28 12:00 |
14:17:52.63 |
-20:18:45.3 |
HIP 69828 |
21.73 |
| 2026-05-29 00:00 |
14:17:48.75 |
-20:18:25.1 |
HIP 69828 |
21.18 |
| 2026-05-29 12:00 |
14:17:44.89 |
-20:18:04.9 |
HIP 69828 |
20.66 |
| 2026-05-30 00:00 |
14:17:41.05 |
-20:17:44.7 |
HIP 69828 |
20.17 |
| 2026-05-30 12:00 |
14:17:37.23 |
-20:17:24.6 |
HIP 69828 |
19.71 |
| 2026-05-31 00:00 |
14:17:33.43 |
-20:17:04.6 |
HIP 69828 |
19.30 |
| 2026-05-31 12:00 |
14:17:29.65 |
-20:16:44.5 |
HIP 69828 |
18.93 |
| 2026-06-01 00:00 |
14:17:25.89 |
-20:16:24.5 |
HIP 69828 |
18.59 |
| 2026-06-01 12:00 |
14:17:22.15 |
-20:16:04.6 |
HIP 69828 |
18.30 |
| 2026-06-02 00:00 |
14:17:18.43 |
-20:15:44.7 |
HIP 69828 |
18.05 |