P/2011 JB15 (Spacewatch-Boattini)
| Parameter |
Value |
| Designation |
P/2011 JB15 (Spacewatch-Boattini) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-01-21T16:06:25.079040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:49Z |
| Obs used |
120 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
13.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2011-06-09.0000000 |
| e |
0.31873584 |
| q (au) |
5.018710 |
| a (au) |
7.366761 |
| i (deg) |
19.141273 |
| Ω (om, deg) |
153.768180 |
| ω (w, deg) |
110.926709 |
| M (ma, deg) |
348.826598 |
Magnitude
Scatter + Global Linear
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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 |
08:34:30.50 |
+09:12:17.9 |
HIP 42084 |
10.28 |
| 2026-02-03 12:00 |
08:34:19.89 |
+09:13:23.0 |
HIP 42084 |
10.19 |
| 2026-02-04 00:00 |
08:34:09.29 |
+09:14:28.4 |
HIP 42084 |
10.86 |
| 2026-02-04 12:00 |
08:33:58.72 |
+09:15:34.0 |
HIP 42084 |
12.16 |
| 2026-02-05 00:00 |
08:33:48.16 |
+09:16:39.8 |
HIP 42084 |
13.92 |
| 2026-02-05 12:00 |
08:33:37.63 |
+09:17:45.9 |
HIP 42084 |
15.98 |
| 2026-02-06 00:00 |
08:33:27.12 |
+09:18:52.2 |
HIP 42084 |
18.24 |
| 2026-02-06 12:00 |
08:33:16.63 |
+09:19:58.7 |
HIP 42084 |
20.63 |
| 2026-02-07 00:00 |
08:33:06.17 |
+09:21:05.4 |
HIP 42084 |
23.11 |
| 2026-02-07 12:00 |
08:32:55.74 |
+09:22:12.3 |
HIP 42084 |
25.65 |
| 2026-02-08 00:00 |
08:32:45.34 |
+09:23:19.3 |
HIP 41776 |
26.68 |
| 2026-02-08 12:00 |
08:32:34.97 |
+09:24:26.6 |
HIP 41776 |
24.94 |
| 2026-02-09 00:00 |
08:32:24.63 |
+09:25:34.1 |
HIP 41776 |
23.41 |
| 2026-02-09 12:00 |
08:32:14.32 |
+09:26:41.7 |
HIP 41776 |
22.13 |
| 2026-02-10 00:00 |
08:32:04.05 |
+09:27:49.5 |
HIP 41776 |
21.15 |
| 2026-02-10 12:00 |
08:31:53.81 |
+09:28:57.5 |
HIP 41843 |
19.89 |
| 2026-02-11 00:00 |
08:31:43.61 |
+09:30:05.6 |
HIP 41843 |
18.95 |
| 2026-02-11 12:00 |
08:31:33.45 |
+09:31:13.8 |
HIP 41843 |
18.36 |
| 2026-02-12 00:00 |
08:31:23.34 |
+09:32:22.2 |
HIP 41843 |
18.18 |
| 2026-02-12 12:00 |
08:31:13.26 |
+09:33:30.8 |
HIP 41843 |
18.40 |
| 2026-02-13 00:00 |
08:31:03.23 |
+09:34:39.4 |
HIP 41843 |
19.00 |
| 2026-02-13 12:00 |
08:30:53.24 |
+09:35:48.2 |
HIP 41843 |
19.95 |
| 2026-02-14 00:00 |
08:30:43.30 |
+09:36:57.1 |
HIP 41648 |
20.56 |
| 2026-02-14 12:00 |
08:30:33.40 |
+09:38:06.0 |
HIP 41648 |
19.22 |
| 2026-02-15 00:00 |
08:30:23.56 |
+09:39:15.1 |
HIP 41648 |
18.19 |
| 2026-02-15 12:00 |
08:30:13.77 |
+09:40:24.3 |
HIP 41648 |
17.53 |
| 2026-02-16 00:00 |
08:30:04.03 |
+09:41:33.5 |
HIP 41648 |
17.26 |
| 2026-02-16 12:00 |
08:29:54.34 |
+09:42:42.8 |
HIP 41648 |
17.41 |
| 2026-02-17 00:00 |
08:29:44.70 |
+09:43:52.2 |
HIP 41648 |
17.96 |
| 2026-02-17 12:00 |
08:29:35.13 |
+09:45:01.7 |
HIP 41648 |
18.87 |
| 2026-02-18 00:00 |
08:29:25.61 |
+09:46:11.2 |
HIP 41648 |
20.08 |
| 2026-02-18 12:00 |
08:29:16.15 |
+09:47:20.7 |
HIP 41648 |
21.54 |
| 2026-02-19 00:00 |
08:29:06.75 |
+09:48:30.3 |
HIP 41648 |
23.20 |
| 2026-02-19 12:00 |
08:28:57.41 |
+09:49:39.9 |
HIP 41648 |
25.01 |
| 2026-02-20 00:00 |
08:28:48.13 |
+09:50:49.6 |
HIP 41613 |
26.38 |
| 2026-02-20 12:00 |
08:28:38.92 |
+09:51:59.2 |
HIP 41613 |
25.62 |
| 2026-02-21 00:00 |
08:28:29.78 |
+09:53:08.9 |
HIP 41613 |
25.09 |
| 2026-02-21 12:00 |
08:28:20.70 |
+09:54:18.5 |
HIP 41613 |
24.81 |
| 2026-02-22 00:00 |
08:28:11.69 |
+09:55:28.2 |
HIP 41613 |
24.77 |
| 2026-02-22 12:00 |
08:28:02.75 |
+09:56:37.8 |
HIP 41378 |
24.75 |
| 2026-02-23 00:00 |
08:27:53.88 |
+09:57:47.5 |
HIP 41378 |
22.31 |
| 2026-02-23 12:00 |
08:27:45.08 |
+09:58:57.1 |
HIP 41378 |
19.89 |
| 2026-02-24 00:00 |
08:27:36.35 |
+10:00:06.6 |
HIP 41378 |
17.50 |