| 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 |
0.848 |
| 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) |
| 2026-03-26 00:00 |
22:48:40.35 |
-12:49:24.6 |
HIP 112551 |
23.38 |
| 2026-03-26 12:00 |
22:48:49.85 |
-12:48:22.7 |
HIP 112551 |
24.01 |
| 2026-03-27 00:00 |
22:48:59.32 |
-12:47:21.0 |
HIP 112799 |
23.84 |
| 2026-03-27 12:00 |
22:49:08.75 |
-12:46:19.5 |
HIP 112799 |
21.37 |
| 2026-03-28 00:00 |
22:49:18.16 |
-12:45:18.3 |
HIP 112799 |
18.91 |
| 2026-03-28 12:00 |
22:49:27.54 |
-12:44:17.3 |
HIP 112799 |
16.47 |
| 2026-03-29 00:00 |
22:49:36.90 |
-12:43:16.6 |
HIP 112799 |
14.07 |
| 2026-03-29 12:00 |
22:49:46.22 |
-12:42:16.1 |
HIP 112799 |
11.70 |
| 2026-03-30 00:00 |
22:49:55.51 |
-12:41:15.9 |
HIP 112799 |
9.41 |
| 2026-03-30 12:00 |
22:50:04.77 |
-12:40:15.9 |
HIP 112799 |
7.26 |
| 2026-03-31 00:00 |
22:50:14.00 |
-12:39:16.1 |
HIP 112799 |
5.38 |
| 2026-03-31 12:00 |
22:50:23.19 |
-12:38:16.6 |
HIP 112799 |
4.17 |
| 2026-04-01 00:00 |
22:50:32.36 |
-12:37:17.4 |
HIP 112799 |
4.22 |
| 2026-04-01 12:00 |
22:50:41.49 |
-12:36:18.4 |
HIP 112799 |
5.48 |
| 2026-04-02 00:00 |
22:50:50.59 |
-12:35:19.7 |
HIP 112799 |
7.36 |
| 2026-04-02 12:00 |
22:50:59.66 |
-12:34:21.2 |
HIP 112799 |
9.47 |
| 2026-04-03 00:00 |
22:51:08.69 |
-12:33:23.0 |
HIP 112799 |
11.70 |
| 2026-04-03 12:00 |
22:51:17.69 |
-12:32:25.0 |
HIP 112799 |
13.98 |
| 2026-04-04 00:00 |
22:51:26.66 |
-12:31:27.4 |
HIP 112799 |
16.28 |
| 2026-04-04 12:00 |
22:51:35.59 |
-12:30:30.0 |
HIP 112799 |
18.60 |
| 2026-04-05 00:00 |
22:51:44.49 |
-12:29:32.8 |
HIP 112799 |
20.92 |
| 2026-04-05 12:00 |
22:51:53.35 |
-12:28:36.0 |
HIP 112799 |
23.24 |
| 2026-04-06 00:00 |
22:52:02.17 |
-12:27:39.4 |
HIP 112799 |
25.55 |
| 2026-04-06 12:00 |
22:52:10.96 |
-12:26:43.1 |
HIP 112799 |
27.87 |
| 2026-04-07 00:00 |
22:52:19.71 |
-12:25:47.1 |
HIP 113085 |
29.90 |
| 2026-04-07 12:00 |
22:52:28.43 |
-12:24:51.3 |
HIP 113085 |
27.59 |
| 2026-04-08 00:00 |
22:52:37.10 |
-12:23:55.9 |
HIP 113085 |
25.29 |
| 2026-04-08 12:00 |
22:52:45.74 |
-12:23:00.7 |
HIP 113085 |
23.01 |
| 2026-04-09 00:00 |
22:52:54.34 |
-12:22:05.8 |
HIP 113085 |
20.73 |
| 2026-04-09 12:00 |
22:53:02.90 |
-12:21:11.3 |
HIP 113085 |
18.47 |
| 2026-04-10 00:00 |
22:53:11.43 |
-12:20:17.0 |
HIP 113085 |
16.23 |
| 2026-04-10 12:00 |
22:53:19.91 |
-12:19:23.0 |
HIP 113085 |
14.01 |
| 2026-04-11 00:00 |
22:53:28.35 |
-12:18:29.3 |
HIP 113085 |
11.81 |
| 2026-04-11 12:00 |
22:53:36.75 |
-12:17:35.9 |
HIP 113085 |
9.65 |
| 2026-04-12 00:00 |
22:53:45.11 |
-12:16:42.8 |
HIP 113085 |
7.54 |
| 2026-04-12 12:00 |
22:53:53.43 |
-12:15:50.1 |
HIP 113085 |
5.54 |
| 2026-04-13 00:00 |
22:54:01.71 |
-12:14:57.6 |
HIP 113085 |
3.78 |
| 2026-04-13 12:00 |
22:54:09.95 |
-12:14:05.4 |
HIP 113085 |
2.76 |
| 2026-04-14 00:00 |
22:54:18.14 |
-12:13:13.6 |
HIP 113085 |
3.25 |
| 2026-04-14 12:00 |
22:54:26.29 |
-12:12:22.1 |
HIP 113085 |
4.79 |
| 2026-04-15 00:00 |
22:54:34.40 |
-12:11:30.9 |
HIP 113085 |
6.67 |
| 2026-04-15 12:00 |
22:54:42.46 |
-12:10:40.0 |
HIP 113085 |
8.67 |
| 2026-04-16 00:00 |
22:54:50.47 |
-12:09:49.5 |
HIP 113085 |
10.72 |