| Parameter |
Value |
| Designation |
P/2015 B1 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-09-19T17:29:17.494080Z |
| Orbit solution date (soln_date, UTC) |
2024-10-10T18:10:33Z |
| Obs used |
92 |
| NEO |
- |
| M1 |
8.700 |
| K1 |
10.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2015-01-29T12:27:06.048000Z |
| Discovery magnitude (MPC) |
20.50 T |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-03-20.0000000 |
| e |
0.38244485 |
| q (au) |
5.975638 |
| a (au) |
9.676282 |
| i (deg) |
18.027730 |
| Ω (om, deg) |
353.355655 |
| ω (w, deg) |
188.274147 |
| M (ma, deg) |
353.983856 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.115 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.115 |
| n |
2.000 |
| gf |
0.849 |
| gb |
-0.957 |
| k |
1.000 |
| δ90 |
2.031 |
| 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 |
22:46:46.60 |
-12:42:05.8 |
HIP 112551 |
18.40 |
| 2026-09-20 12:00 |
22:46:39.19 |
-12:42:34.0 |
HIP 112551 |
20.11 |
| 2026-09-21 00:00 |
22:46:31.82 |
-12:43:02.0 |
HIP 112551 |
21.84 |
| 2026-09-21 12:00 |
22:46:24.47 |
-12:43:29.7 |
HIP 112352 |
21.95 |
| 2026-09-22 00:00 |
22:46:17.15 |
-12:43:57.0 |
HIP 112352 |
20.49 |
| 2026-09-22 12:00 |
22:46:09.86 |
-12:44:24.1 |
HIP 112352 |
19.10 |
| 2026-09-23 00:00 |
22:46:02.60 |
-12:44:50.9 |
HIP 112352 |
17.81 |
| 2026-09-23 12:00 |
22:45:55.38 |
-12:45:17.4 |
HIP 112352 |
16.62 |
| 2026-09-24 00:00 |
22:45:48.18 |
-12:45:43.5 |
HIP 112352 |
15.56 |
| 2026-09-24 12:00 |
22:45:41.03 |
-12:46:09.4 |
HIP 112352 |
14.66 |
| 2026-09-25 00:00 |
22:45:33.90 |
-12:46:34.9 |
HIP 112352 |
13.93 |
| 2026-09-25 12:00 |
22:45:26.82 |
-12:47:00.1 |
HIP 112352 |
13.41 |
| 2026-09-26 00:00 |
22:45:19.77 |
-12:47:25.1 |
HIP 112352 |
13.12 |
| 2026-09-26 12:00 |
22:45:12.75 |
-12:47:49.6 |
HIP 112352 |
13.06 |
| 2026-09-27 00:00 |
22:45:05.77 |
-12:48:13.9 |
HIP 112352 |
13.24 |
| 2026-09-27 12:00 |
22:44:58.84 |
-12:48:37.8 |
HIP 112352 |
13.65 |
| 2026-09-28 00:00 |
22:44:51.94 |
-12:49:01.4 |
HIP 112352 |
14.25 |
| 2026-09-28 12:00 |
22:44:45.07 |
-12:49:24.7 |
HIP 112238 |
13.15 |
| 2026-09-29 00:00 |
22:44:38.25 |
-12:49:47.6 |
HIP 112238 |
12.17 |
| 2026-09-29 12:00 |
22:44:31.48 |
-12:50:10.2 |
HIP 112238 |
11.36 |
| 2026-09-30 00:00 |
22:44:24.74 |
-12:50:32.4 |
HIP 112238 |
10.76 |
| 2026-09-30 12:00 |
22:44:18.04 |
-12:50:54.3 |
HIP 112238 |
10.40 |
| 2026-10-01 00:00 |
22:44:11.39 |
-12:51:15.8 |
HIP 112238 |
10.30 |
| 2026-10-01 12:00 |
22:44:04.78 |
-12:51:37.0 |
HIP 112238 |
10.46 |
| 2026-10-02 00:00 |
22:43:58.22 |
-12:51:57.8 |
HIP 112238 |
10.86 |
| 2026-10-02 12:00 |
22:43:51.70 |
-12:52:18.3 |
HIP 112238 |
11.48 |
| 2026-10-03 00:00 |
22:43:45.23 |
-12:52:38.4 |
HIP 112238 |
12.27 |
| 2026-10-03 12:00 |
22:43:38.80 |
-12:52:58.1 |
HIP 112238 |
13.20 |
| 2026-10-04 00:00 |
22:43:32.43 |
-12:53:17.5 |
HIP 112238 |
14.24 |
| 2026-10-04 12:00 |
22:43:26.10 |
-12:53:36.5 |
HIP 112238 |
15.36 |
| 2026-10-05 00:00 |
22:43:19.81 |
-12:53:55.1 |
HIP 112238 |
16.54 |
| 2026-10-05 12:00 |
22:43:13.58 |
-12:54:13.3 |
HIP 112238 |
17.77 |
| 2026-10-06 00:00 |
22:43:07.40 |
-12:54:31.2 |
HIP 112238 |
19.03 |
| 2026-10-06 12:00 |
22:43:01.27 |
-12:54:48.6 |
HIP 112053 |
18.51 |
| 2026-10-07 00:00 |
22:42:55.19 |
-12:55:05.7 |
HIP 112053 |
17.07 |
| 2026-10-07 12:00 |
22:42:49.16 |
-12:55:22.4 |
HIP 112053 |
15.66 |
| 2026-10-08 00:00 |
22:42:43.19 |
-12:55:38.7 |
HIP 112053 |
14.27 |
| 2026-10-08 12:00 |
22:42:37.27 |
-12:55:54.6 |
HIP 112053 |
12.92 |
| 2026-10-09 00:00 |
22:42:31.40 |
-12:56:10.1 |
HIP 112053 |
11.60 |
| 2026-10-09 12:00 |
22:42:25.59 |
-12:56:25.2 |
HIP 112053 |
10.33 |
| 2026-10-10 00:00 |
22:42:19.84 |
-12:56:39.8 |
HIP 112053 |
9.12 |
| 2026-10-10 12:00 |
22:42:14.14 |
-12:56:54.1 |
HIP 112053 |
7.99 |
| 2026-10-11 00:00 |
22:42:08.50 |
-12:57:08.0 |
HIP 112053 |
6.97 |