P/2009 B1 (Boattini)
| Parameter |
Value |
| Designation |
P/2009 B1 (Boattini) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-02-06T04:48:47.580480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:28Z |
| Obs used |
111 |
| NEO |
- |
| M1 |
13.200 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2009-01-31.0000000 |
| e |
0.63719062 |
| q (au) |
2.426592 |
| a (au) |
6.688339 |
| i (deg) |
22.228478 |
| Ω (om, deg) |
297.438307 |
| ω (w, deg) |
128.593842 |
| M (ma, deg) |
359.646689 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.341 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.341 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.902 |
| δ90 |
1.000 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
23:43:15.13 |
+18:37:31.2 |
HIP 116961 |
10.67 |
| 2026-02-03 12:00 |
23:44:02.43 |
+18:40:58.9 |
HIP 116961 |
21.60 |
| 2026-02-04 00:00 |
23:44:49.87 |
+18:44:27.9 |
HIP 117042 |
29.33 |
| 2026-02-04 12:00 |
23:45:37.46 |
+18:47:58.1 |
HIP 117042 |
35.15 |
| 2026-02-05 00:00 |
23:46:25.20 |
+18:51:29.5 |
HIP 117428 |
37.87 |
| 2026-02-05 12:00 |
23:47:13.09 |
+18:55:02.1 |
HIP 117428 |
31.76 |
| 2026-02-06 00:00 |
23:48:01.12 |
+18:58:35.9 |
HIP 117428 |
29.43 |
| 2026-02-06 12:00 |
23:48:49.30 |
+19:02:10.9 |
HIP 117428 |
31.77 |
| 2026-02-07 00:00 |
23:49:37.62 |
+19:05:47.1 |
HIP 117531 |
35.02 |
| 2026-02-07 12:00 |
23:50:26.10 |
+19:09:24.4 |
HIP 117718 |
29.18 |
| 2026-02-08 00:00 |
23:51:14.71 |
+19:13:02.9 |
HIP 117718 |
18.55 |
| 2026-02-08 12:00 |
23:52:03.47 |
+19:16:42.5 |
HIP 117718 |
11.28 |
| 2026-02-09 00:00 |
23:52:52.38 |
+19:20:23.3 |
HIP 117791 |
6.23 |
| 2026-02-09 12:00 |
23:53:41.43 |
+19:24:05.2 |
HIP 117791 |
6.51 |
| 2026-02-10 00:00 |
23:54:30.62 |
+19:27:48.2 |
HIP 117791 |
18.50 |
| 2026-02-10 12:00 |
23:55:19.96 |
+19:31:32.3 |
HIP 117791 |
30.67 |
| 2026-02-11 00:00 |
23:56:09.44 |
+19:35:17.5 |
HIP 118176 |
31.16 |
| 2026-02-11 12:00 |
23:56:59.06 |
+19:39:03.7 |
HIP 118176 |
18.99 |
| 2026-02-12 00:00 |
23:57:48.83 |
+19:42:51.1 |
HIP 118176 |
7.21 |
| 2026-02-12 12:00 |
23:58:38.73 |
+19:46:39.5 |
HIP 118176 |
6.86 |
| 2026-02-13 00:00 |
23:59:28.78 |
+19:50:29.0 |
HIP 7 |
14.54 |
| 2026-02-13 12:00 |
00:00:18.97 |
+19:54:19.5 |
HIP 7 |
8.49 |
| 2026-02-14 00:00 |
00:01:09.30 |
+19:58:11.0 |
HIP 100 |
13.79 |
| 2026-02-14 12:00 |
00:01:59.76 |
+20:02:03.5 |
HIP 100 |
20.38 |
| 2026-02-15 00:00 |
00:02:50.37 |
+20:05:57.1 |
HIP 100 |
30.88 |
| 2026-02-15 12:00 |
00:03:41.12 |
+20:09:51.6 |
HIP 276 |
30.31 |
| 2026-02-16 00:00 |
00:04:32.01 |
+20:13:47.1 |
HIP 276 |
30.41 |
| 2026-02-16 12:00 |
00:05:23.03 |
+20:17:43.6 |
HIP 562 |
25.94 |
| 2026-02-17 00:00 |
00:06:14.19 |
+20:21:41.0 |
HIP 562 |
14.64 |
| 2026-02-17 12:00 |
00:07:05.49 |
+20:25:39.4 |
HIP 598 |
7.97 |
| 2026-02-18 00:00 |
00:07:56.93 |
+20:29:38.7 |
HIP 598 |
10.61 |
| 2026-02-18 12:00 |
00:08:48.50 |
+20:33:39.0 |
HIP 693 |
18.06 |
| 2026-02-19 00:00 |
00:09:40.21 |
+20:37:40.1 |
HIP 748 |
26.78 |
| 2026-02-19 12:00 |
00:10:32.06 |
+20:41:42.1 |
HIP 748 |
28.91 |
| 2026-02-20 00:00 |
00:11:24.04 |
+20:45:45.0 |
HIP 1064 |
25.50 |
| 2026-02-20 12:00 |
00:12:16.15 |
+20:49:48.8 |
HIP 1064 |
14.10 |
| 2026-02-21 00:00 |
00:13:08.40 |
+20:53:53.4 |
HIP 1064 |
8.79 |
| 2026-02-21 12:00 |
00:14:00.78 |
+20:57:58.9 |
HIP 1064 |
16.98 |
| 2026-02-22 00:00 |
00:14:53.29 |
+21:02:05.1 |
HIP 1334 |
27.78 |
| 2026-02-22 12:00 |
00:15:45.94 |
+21:06:12.2 |
HIP 1334 |
19.93 |
| 2026-02-23 00:00 |
00:16:38.72 |
+21:10:20.1 |
HIP 1334 |
18.96 |
| 2026-02-23 12:00 |
00:17:31.63 |
+21:14:28.7 |
HIP 1482 |
19.21 |
| 2026-02-24 00:00 |
00:18:24.67 |
+21:18:38.2 |
HIP 1482 |
10.04 |