| 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) |
| 2026-03-26 00:00 |
05:49:18.12 |
+19:42:01.5 |
HIP 27465 |
37.70 |
| 2026-03-26 12:00 |
05:49:30.64 |
+19:42:27.6 |
HIP 27697 |
35.14 |
| 2026-03-27 00:00 |
05:49:43.34 |
+19:42:53.6 |
HIP 27697 |
32.47 |
| 2026-03-27 12:00 |
05:49:56.21 |
+19:43:19.5 |
HIP 27697 |
29.83 |
| 2026-03-28 00:00 |
05:50:09.25 |
+19:43:45.3 |
HIP 27697 |
27.24 |
| 2026-03-28 12:00 |
05:50:22.47 |
+19:44:11.0 |
HIP 27697 |
24.73 |
| 2026-03-29 00:00 |
05:50:35.85 |
+19:44:36.6 |
HIP 27697 |
22.36 |
| 2026-03-29 12:00 |
05:50:49.40 |
+19:45:02.0 |
HIP 27697 |
20.17 |
| 2026-03-30 00:00 |
05:51:03.12 |
+19:45:27.3 |
HIP 27697 |
18.27 |
| 2026-03-30 12:00 |
05:51:17.00 |
+19:45:52.5 |
HIP 27697 |
16.77 |
| 2026-03-31 00:00 |
05:51:31.05 |
+19:46:17.6 |
HIP 27747 |
13.60 |
| 2026-03-31 12:00 |
05:51:45.27 |
+19:46:42.5 |
HIP 27747 |
10.45 |
| 2026-04-01 00:00 |
05:51:59.64 |
+19:47:07.3 |
HIP 27747 |
7.47 |
| 2026-04-01 12:00 |
05:52:14.18 |
+19:47:31.9 |
HIP 27747 |
5.03 |
| 2026-04-02 00:00 |
05:52:28.88 |
+19:47:56.4 |
HIP 27747 |
4.33 |
| 2026-04-02 12:00 |
05:52:43.74 |
+19:48:20.7 |
HIP 27747 |
6.06 |
| 2026-04-03 00:00 |
05:52:58.77 |
+19:48:44.9 |
HIP 27747 |
8.95 |
| 2026-04-03 12:00 |
05:53:13.95 |
+19:49:08.9 |
HIP 27747 |
12.24 |
| 2026-04-04 00:00 |
05:53:29.28 |
+19:49:32.8 |
HIP 27747 |
15.69 |
| 2026-04-04 12:00 |
05:53:44.78 |
+19:49:56.5 |
HIP 27965 |
17.63 |
| 2026-04-05 00:00 |
05:54:00.42 |
+19:50:20.1 |
HIP 27965 |
14.28 |
| 2026-04-05 12:00 |
05:54:16.23 |
+19:50:43.5 |
HIP 27965 |
11.12 |
| 2026-04-06 00:00 |
05:54:32.19 |
+19:51:06.7 |
HIP 27965 |
8.42 |
| 2026-04-06 12:00 |
05:54:48.30 |
+19:51:29.7 |
HIP 27965 |
6.81 |
| 2026-04-07 00:00 |
05:55:04.56 |
+19:51:52.5 |
HIP 27965 |
7.14 |
| 2026-04-07 12:00 |
05:55:20.98 |
+19:52:15.2 |
HIP 27965 |
9.25 |
| 2026-04-08 00:00 |
05:55:37.54 |
+19:52:37.7 |
HIP 27965 |
12.28 |
| 2026-04-08 12:00 |
05:55:54.25 |
+19:53:00.0 |
HIP 27965 |
15.74 |
| 2026-04-09 00:00 |
05:56:11.12 |
+19:53:22.1 |
HIP 28041 |
17.90 |
| 2026-04-09 12:00 |
05:56:28.13 |
+19:53:44.0 |
HIP 28041 |
19.11 |
| 2026-04-10 00:00 |
05:56:45.28 |
+19:54:05.6 |
HIP 28041 |
21.05 |
| 2026-04-10 12:00 |
05:57:02.58 |
+19:54:27.1 |
HIP 28041 |
23.56 |
| 2026-04-11 00:00 |
05:57:20.03 |
+19:54:48.4 |
HIP 28041 |
26.49 |
| 2026-04-11 12:00 |
05:57:37.62 |
+19:55:09.5 |
HIP 28294 |
23.81 |
| 2026-04-12 00:00 |
05:57:55.36 |
+19:55:30.4 |
HIP 28294 |
20.87 |
| 2026-04-12 12:00 |
05:58:13.23 |
+19:55:51.0 |
HIP 28294 |
18.41 |
| 2026-04-13 00:00 |
05:58:31.25 |
+19:56:11.4 |
HIP 28373 |
15.99 |
| 2026-04-13 12:00 |
05:58:49.41 |
+19:56:31.6 |
HIP 28373 |
11.78 |
| 2026-04-14 00:00 |
05:59:07.71 |
+19:56:51.6 |
HIP 28373 |
7.64 |
| 2026-04-14 12:00 |
05:59:26.14 |
+19:57:11.3 |
HIP 28373 |
3.84 |
| 2026-04-15 00:00 |
05:59:44.72 |
+19:57:30.8 |
HIP 28373 |
3.01 |
| 2026-04-15 12:00 |
06:00:03.43 |
+19:57:50.1 |
HIP 28425 |
2.20 |
| 2026-04-16 00:00 |
06:00:22.27 |
+19:58:09.1 |
HIP 28425 |
3.21 |