| Parameter |
Value |
| Designation |
87P/Bus |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-12-19T21:38:08.010240Z |
| Orbit solution date (soln_date, UTC) |
2020-09-28T09:20:31Z |
| Obs used |
667 |
| NEO |
- |
| M1 |
12.700 |
| K1 |
14.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-03-20.0000000 |
| e |
0.38934769 |
| q (au) |
2.101175 |
| a (au) |
3.440869 |
| i (deg) |
2.602394 |
| Ω (om, deg) |
181.889806 |
| ω (w, deg) |
24.756386 |
| M (ma, deg) |
126.793522 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.080 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.080 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.756 |
| k |
0.993 |
| δ90 |
10.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-25 00:00 |
08:22:50.13 |
+16:14:02.6 |
HIP 41040 |
6.13 |
| 2026-09-25 12:00 |
08:23:11.56 |
+16:12:39.5 |
HIP 41040 |
9.96 |
| 2026-09-26 00:00 |
08:23:32.89 |
+16:11:16.4 |
HIP 41040 |
14.72 |
| 2026-09-26 12:00 |
08:23:54.10 |
+16:09:53.5 |
HIP 41040 |
19.74 |
| 2026-09-27 00:00 |
08:24:15.21 |
+16:08:30.7 |
HIP 41040 |
24.84 |
| 2026-09-27 12:00 |
08:24:36.20 |
+16:07:08.0 |
HIP 41040 |
29.97 |
| 2026-09-28 00:00 |
08:24:57.09 |
+16:05:45.5 |
HIP 41040 |
35.10 |
| 2026-09-28 12:00 |
08:25:17.85 |
+16:04:23.1 |
HIP 41492 |
36.77 |
| 2026-09-29 00:00 |
08:25:38.51 |
+16:03:00.8 |
HIP 41492 |
31.62 |
| 2026-09-29 12:00 |
08:25:59.05 |
+16:01:38.7 |
HIP 41492 |
26.51 |
| 2026-09-30 00:00 |
08:26:19.48 |
+16:00:16.8 |
HIP 41492 |
21.42 |
| 2026-09-30 12:00 |
08:26:39.79 |
+15:58:55.0 |
HIP 41492 |
16.36 |
| 2026-10-01 00:00 |
08:26:59.98 |
+15:57:33.4 |
HIP 41492 |
11.34 |
| 2026-10-01 12:00 |
08:27:20.06 |
+15:56:12.0 |
HIP 41492 |
6.39 |
| 2026-10-02 00:00 |
08:27:40.01 |
+15:54:50.8 |
HIP 41492 |
1.79 |
| 2026-10-02 12:00 |
08:27:59.85 |
+15:53:29.8 |
HIP 41492 |
3.89 |
| 2026-10-03 00:00 |
08:28:19.56 |
+15:52:08.9 |
HIP 41492 |
8.70 |
| 2026-10-03 12:00 |
08:28:39.16 |
+15:50:48.3 |
HIP 41492 |
13.56 |
| 2026-10-04 00:00 |
08:28:58.63 |
+15:49:27.9 |
HIP 41492 |
18.42 |
| 2026-10-04 12:00 |
08:29:17.97 |
+15:48:07.6 |
HIP 41686 |
17.91 |
| 2026-10-05 00:00 |
08:29:37.19 |
+15:46:47.7 |
HIP 41686 |
15.05 |
| 2026-10-05 12:00 |
08:29:56.28 |
+15:45:27.9 |
HIP 41686 |
13.36 |
| 2026-10-06 00:00 |
08:30:15.25 |
+15:44:08.4 |
HIP 41686 |
13.27 |
| 2026-10-06 12:00 |
08:30:34.08 |
+15:42:49.1 |
HIP 41686 |
14.77 |
| 2026-10-07 00:00 |
08:30:52.79 |
+15:41:30.1 |
HIP 41686 |
17.44 |
| 2026-10-07 12:00 |
08:31:11.37 |
+15:40:11.4 |
HIP 41686 |
20.81 |
| 2026-10-08 00:00 |
08:31:29.81 |
+15:38:52.9 |
HIP 41900 |
17.36 |
| 2026-10-08 12:00 |
08:31:48.12 |
+15:37:34.7 |
HIP 41900 |
13.84 |
| 2026-10-09 00:00 |
08:32:06.30 |
+15:36:16.8 |
HIP 41900 |
11.16 |
| 2026-10-09 12:00 |
08:32:24.35 |
+15:34:59.2 |
HIP 41900 |
9.96 |
| 2026-10-10 00:00 |
08:32:42.25 |
+15:33:41.8 |
HIP 41900 |
10.72 |
| 2026-10-10 12:00 |
08:33:00.02 |
+15:32:24.8 |
HIP 41900 |
13.06 |
| 2026-10-11 00:00 |
08:33:17.66 |
+15:31:08.1 |
HIP 41900 |
16.29 |
| 2026-10-11 12:00 |
08:33:35.15 |
+15:29:51.7 |
HIP 41913 |
18.29 |
| 2026-10-12 00:00 |
08:33:52.50 |
+15:28:35.6 |
HIP 41913 |
20.59 |
| 2026-10-12 12:00 |
08:34:09.72 |
+15:27:19.8 |
HIP 42131 |
23.20 |
| 2026-10-13 00:00 |
08:34:26.79 |
+15:26:04.4 |
HIP 42131 |
21.53 |
| 2026-10-13 12:00 |
08:34:43.71 |
+15:24:49.4 |
HIP 42131 |
20.65 |
| 2026-10-14 00:00 |
08:35:00.50 |
+15:23:34.7 |
HIP 42187 |
16.89 |
| 2026-10-14 12:00 |
08:35:17.14 |
+15:22:20.3 |
HIP 42187 |
12.69 |
| 2026-10-15 00:00 |
08:35:33.63 |
+15:21:06.4 |
HIP 42187 |
8.53 |
| 2026-10-15 12:00 |
08:35:49.98 |
+15:19:52.7 |
HIP 42187 |
4.40 |
| 2026-10-16 00:00 |
08:36:06.18 |
+15:18:39.5 |
HIP 42187 |
0.40 |