| 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) |
| 2026-09-20 00:00 |
09:27:28.13 |
+09:33:45.3 |
HIP 46454 |
33.68 |
| 2026-09-20 12:00 |
09:27:42.19 |
+09:32:46.3 |
HIP 46454 |
31.41 |
| 2026-09-21 00:00 |
09:27:56.20 |
+09:31:47.4 |
HIP 46454 |
29.41 |
| 2026-09-21 12:00 |
09:28:10.15 |
+09:30:48.6 |
HIP 46454 |
27.73 |
| 2026-09-22 00:00 |
09:28:24.06 |
+09:29:49.9 |
HIP 46454 |
26.44 |
| 2026-09-22 12:00 |
09:28:37.92 |
+09:28:51.3 |
HIP 46454 |
25.58 |
| 2026-09-23 00:00 |
09:28:51.72 |
+09:27:52.8 |
HIP 46454 |
25.20 |
| 2026-09-23 12:00 |
09:29:05.47 |
+09:26:54.4 |
HIP 46454 |
25.31 |
| 2026-09-24 00:00 |
09:29:19.17 |
+09:25:56.1 |
HIP 46568 |
24.99 |
| 2026-09-24 12:00 |
09:29:32.82 |
+09:24:57.9 |
HIP 46568 |
25.16 |
| 2026-09-25 00:00 |
09:29:46.42 |
+09:23:59.8 |
HIP 46568 |
25.80 |
| 2026-09-25 12:00 |
09:29:59.96 |
+09:23:01.8 |
HIP 46568 |
26.88 |
| 2026-09-26 00:00 |
09:30:13.44 |
+09:22:04.0 |
HIP 46764 |
26.94 |
| 2026-09-26 12:00 |
09:30:26.87 |
+09:21:06.3 |
HIP 46764 |
23.52 |
| 2026-09-27 00:00 |
09:30:40.25 |
+09:20:08.7 |
HIP 46764 |
20.13 |
| 2026-09-27 12:00 |
09:30:53.56 |
+09:19:11.3 |
HIP 46764 |
16.77 |
| 2026-09-28 00:00 |
09:31:06.83 |
+09:18:14.0 |
HIP 46764 |
13.45 |
| 2026-09-28 12:00 |
09:31:20.03 |
+09:17:16.8 |
HIP 46764 |
10.20 |
| 2026-09-29 00:00 |
09:31:33.18 |
+09:16:19.8 |
HIP 46764 |
7.10 |
| 2026-09-29 12:00 |
09:31:46.27 |
+09:15:23.0 |
HIP 46764 |
4.44 |
| 2026-09-30 00:00 |
09:31:59.30 |
+09:14:26.3 |
HIP 46764 |
3.42 |
| 2026-09-30 12:00 |
09:32:12.27 |
+09:13:29.7 |
HIP 46764 |
5.10 |
| 2026-10-01 00:00 |
09:32:25.18 |
+09:12:33.3 |
HIP 46764 |
7.90 |
| 2026-10-01 12:00 |
09:32:38.03 |
+09:11:37.1 |
HIP 46885 |
9.56 |
| 2026-10-02 00:00 |
09:32:50.82 |
+09:10:41.0 |
HIP 46885 |
6.31 |
| 2026-10-02 12:00 |
09:33:03.55 |
+09:09:45.2 |
HIP 46885 |
3.16 |
| 2026-10-03 00:00 |
09:33:16.21 |
+09:08:49.5 |
HIP 46885 |
1.29 |
| 2026-10-03 12:00 |
09:33:28.81 |
+09:07:53.9 |
HIP 46885 |
3.81 |
| 2026-10-04 00:00 |
09:33:41.35 |
+09:06:58.6 |
HIP 46885 |
6.94 |
| 2026-10-04 12:00 |
09:33:53.83 |
+09:06:03.5 |
HIP 46885 |
10.12 |
| 2026-10-05 00:00 |
09:34:06.24 |
+09:05:08.5 |
HIP 46885 |
13.30 |
| 2026-10-05 12:00 |
09:34:18.58 |
+09:04:13.8 |
HIP 46885 |
16.47 |
| 2026-10-06 00:00 |
09:34:30.86 |
+09:03:19.2 |
HIP 46885 |
19.63 |
| 2026-10-06 12:00 |
09:34:43.07 |
+09:02:24.9 |
HIP 46885 |
22.77 |
| 2026-10-07 00:00 |
09:34:55.21 |
+09:01:30.8 |
HIP 47136 |
24.76 |
| 2026-10-07 12:00 |
09:35:07.29 |
+09:00:36.9 |
HIP 47136 |
21.80 |
| 2026-10-08 00:00 |
09:35:19.29 |
+08:59:43.3 |
HIP 47136 |
18.91 |
| 2026-10-08 12:00 |
09:35:31.23 |
+08:58:49.8 |
HIP 47136 |
16.11 |
| 2026-10-09 00:00 |
09:35:43.09 |
+08:57:56.7 |
HIP 47136 |
13.44 |
| 2026-10-09 12:00 |
09:35:54.89 |
+08:57:03.7 |
HIP 47136 |
10.99 |
| 2026-10-10 00:00 |
09:36:06.61 |
+08:56:11.0 |
HIP 47136 |
8.93 |
| 2026-10-10 12:00 |
09:36:18.27 |
+08:55:18.5 |
HIP 47136 |
7.55 |
| 2026-10-11 00:00 |
09:36:29.85 |
+08:54:26.3 |
HIP 47136 |
7.23 |