| 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
$$
M_a = (11.340 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.340 |
| 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) |
| 2026-09-20 00:00 |
07:52:49.00 |
+29:11:35.3 |
HIP 38391 |
12.09 |
| 2026-09-20 12:00 |
07:53:37.39 |
+29:07:37.8 |
HIP 38586 |
7.76 |
| 2026-09-21 00:00 |
07:54:25.53 |
+29:03:39.8 |
HIP 38586 |
10.15 |
| 2026-09-21 12:00 |
07:55:13.43 |
+28:59:41.1 |
HIP 38586 |
19.92 |
| 2026-09-22 00:00 |
07:56:01.07 |
+28:55:41.9 |
HIP 38586 |
30.65 |
| 2026-09-22 12:00 |
07:56:48.47 |
+28:51:42.0 |
HIP 38677 |
36.10 |
| 2026-09-23 00:00 |
07:57:35.62 |
+28:47:41.6 |
HIP 38941 |
37.16 |
| 2026-09-23 12:00 |
07:58:22.52 |
+28:43:40.6 |
HIP 38941 |
32.85 |
| 2026-09-24 00:00 |
07:59:09.17 |
+28:39:39.1 |
HIP 38941 |
31.93 |
| 2026-09-24 12:00 |
07:59:55.57 |
+28:35:37.0 |
HIP 39276 |
25.71 |
| 2026-09-25 00:00 |
08:00:41.72 |
+28:31:34.5 |
HIP 39276 |
16.76 |
| 2026-09-25 12:00 |
08:01:27.61 |
+28:27:31.4 |
HIP 39276 |
11.81 |
| 2026-09-26 00:00 |
08:02:13.25 |
+28:23:27.8 |
HIP 39308 |
12.41 |
| 2026-09-26 12:00 |
08:02:58.63 |
+28:19:23.7 |
HIP 39308 |
12.91 |
| 2026-09-27 00:00 |
08:03:43.76 |
+28:15:19.1 |
HIP 39308 |
20.25 |
| 2026-09-27 12:00 |
08:04:28.63 |
+28:11:14.1 |
HIP 39393 |
22.84 |
| 2026-09-28 00:00 |
08:05:13.25 |
+28:07:08.6 |
HIP 39393 |
29.05 |
| 2026-09-28 12:00 |
08:05:57.61 |
+28:03:02.7 |
HIP 39607 |
31.59 |
| 2026-09-29 00:00 |
08:06:41.70 |
+27:58:56.4 |
HIP 39607 |
30.69 |
| 2026-09-29 12:00 |
08:07:25.54 |
+27:54:49.6 |
HIP 39888 |
31.97 |
| 2026-09-30 00:00 |
08:08:09.11 |
+27:50:42.5 |
HIP 39888 |
23.65 |
| 2026-09-30 12:00 |
08:08:52.42 |
+27:46:34.9 |
HIP 39888 |
17.77 |
| 2026-10-01 00:00 |
08:09:35.47 |
+27:42:27.0 |
HIP 39888 |
17.00 |
| 2026-10-01 12:00 |
08:10:18.25 |
+27:38:18.7 |
HIP 40075 |
16.61 |
| 2026-10-02 00:00 |
08:11:00.77 |
+27:34:10.1 |
HIP 40075 |
16.22 |
| 2026-10-02 12:00 |
08:11:43.02 |
+27:30:01.2 |
HIP 40075 |
21.47 |
| 2026-10-03 00:00 |
08:12:25.00 |
+27:25:51.9 |
HIP 40311 |
28.63 |
| 2026-10-03 12:00 |
08:13:06.70 |
+27:21:42.3 |
HIP 40387 |
24.57 |
| 2026-10-04 00:00 |
08:13:48.14 |
+27:17:32.4 |
HIP 40387 |
14.52 |
| 2026-10-04 12:00 |
08:14:29.30 |
+27:13:22.3 |
HIP 40387 |
4.76 |
| 2026-10-05 00:00 |
08:15:10.19 |
+27:09:11.8 |
HIP 40401 |
4.98 |
| 2026-10-05 12:00 |
08:15:50.80 |
+27:05:01.1 |
HIP 40401 |
12.99 |
| 2026-10-06 00:00 |
08:16:31.14 |
+27:00:50.2 |
HIP 40603 |
11.72 |
| 2026-10-06 12:00 |
08:17:11.19 |
+26:56:39.1 |
HIP 40603 |
6.82 |
| 2026-10-07 00:00 |
08:17:50.97 |
+26:52:27.7 |
HIP 40603 |
12.22 |
| 2026-10-07 12:00 |
08:18:30.46 |
+26:48:16.1 |
HIP 40792 |
16.85 |
| 2026-10-08 00:00 |
08:19:09.68 |
+26:44:04.4 |
HIP 40792 |
7.49 |
| 2026-10-08 12:00 |
08:19:48.60 |
+26:39:52.4 |
HIP 40792 |
4.01 |
| 2026-10-09 00:00 |
08:20:27.24 |
+26:35:40.3 |
HIP 40792 |
12.70 |
| 2026-10-09 12:00 |
08:21:05.60 |
+26:31:28.1 |
HIP 40792 |
22.10 |
| 2026-10-10 00:00 |
08:21:43.66 |
+26:27:15.7 |
HIP 40792 |
31.54 |
| 2026-10-10 12:00 |
08:22:21.44 |
+26:23:03.2 |
HIP 41194 |
27.40 |
| 2026-10-11 00:00 |
08:22:58.92 |
+26:18:50.6 |
HIP 41194 |
20.69 |