| Parameter |
Value |
| Designation |
455P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-07-23T16:02:18.502080Z |
| Orbit solution date (soln_date, UTC) |
2023-02-09T05:35:52Z |
| Obs used |
71 |
| NEO |
- |
| M1 |
9.400 |
| K1 |
31.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2011-08-21T13:23:27.830400Z |
| Discovery magnitude (MPC) |
23.18 G |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-04-11.0000000 |
| e |
0.30420723 |
| q (au) |
2.195173 |
| a (au) |
3.154924 |
| i (deg) |
14.138047 |
| Ω (om, deg) |
146.211575 |
| ω (w, deg) |
237.939928 |
| M (ma, deg) |
341.766645 |
Magnitude
Scatter + Global Linear
$$
M_a = (20.000 + 3.420\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
20.000 |
| n |
3.420 |
| gf |
0.925 |
| gb |
-0.830 |
| k |
0.981 |
| δ90 |
4.927 |
| 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 |
14:50:58.04 |
-03:43:31.3 |
HIP 72740 |
23.35 |
| 2026-09-20 12:00 |
14:51:25.26 |
-03:46:29.2 |
HIP 72739 |
19.21 |
| 2026-09-21 00:00 |
14:51:52.59 |
-03:49:26.9 |
HIP 72739 |
12.91 |
| 2026-09-21 12:00 |
14:52:20.03 |
-03:52:24.4 |
HIP 72739 |
8.65 |
| 2026-09-22 00:00 |
14:52:47.57 |
-03:55:21.7 |
HIP 72739 |
9.73 |
| 2026-09-22 12:00 |
14:53:15.21 |
-03:58:18.8 |
HIP 72739 |
15.07 |
| 2026-09-23 00:00 |
14:53:42.96 |
-04:01:15.7 |
HIP 72739 |
21.75 |
| 2026-09-23 12:00 |
14:54:10.81 |
-04:04:12.4 |
HIP 73014 |
24.61 |
| 2026-09-24 00:00 |
14:54:38.76 |
-04:07:08.9 |
HIP 73014 |
18.00 |
| 2026-09-24 12:00 |
14:55:06.81 |
-04:10:05.1 |
HIP 73014 |
12.54 |
| 2026-09-25 00:00 |
14:55:34.96 |
-04:13:01.1 |
HIP 73014 |
10.28 |
| 2026-09-25 12:00 |
14:56:03.22 |
-04:15:56.9 |
HIP 73014 |
13.05 |
| 2026-09-26 00:00 |
14:56:31.57 |
-04:18:52.4 |
HIP 73165 |
10.02 |
| 2026-09-26 12:00 |
14:57:00.02 |
-04:21:47.7 |
HIP 73165 |
2.94 |
| 2026-09-27 00:00 |
14:57:28.56 |
-04:24:42.8 |
HIP 73165 |
5.88 |
| 2026-09-27 12:00 |
14:57:57.21 |
-04:27:37.6 |
HIP 73165 |
13.39 |
| 2026-09-28 00:00 |
14:58:25.95 |
-04:30:32.1 |
HIP 73165 |
21.07 |
| 2026-09-28 12:00 |
14:58:54.79 |
-04:33:26.4 |
HIP 73309 |
25.90 |
| 2026-09-29 00:00 |
14:59:23.72 |
-04:36:20.4 |
HIP 73465 |
24.04 |
| 2026-09-29 12:00 |
14:59:52.75 |
-04:39:14.1 |
HIP 73465 |
19.19 |
| 2026-09-30 00:00 |
15:00:21.88 |
-04:42:07.5 |
HIP 73465 |
16.72 |
| 2026-09-30 12:00 |
15:00:51.10 |
-04:45:00.7 |
HIP 73465 |
17.68 |
| 2026-10-01 00:00 |
15:01:20.41 |
-04:47:53.6 |
HIP 73465 |
21.65 |
| 2026-10-01 12:00 |
15:01:49.82 |
-04:50:46.1 |
HIP 73601 |
21.01 |
| 2026-10-02 00:00 |
15:02:19.31 |
-04:53:38.4 |
HIP 73601 |
20.43 |
| 2026-10-02 12:00 |
15:02:48.91 |
-04:56:30.4 |
HIP 73601 |
22.75 |
| 2026-10-03 00:00 |
15:03:18.59 |
-04:59:22.1 |
HIP 73601 |
27.26 |
| 2026-10-03 12:00 |
15:03:48.37 |
-05:02:13.4 |
HIP 73843 |
25.17 |
| 2026-10-04 00:00 |
15:04:18.23 |
-05:05:04.4 |
HIP 73843 |
18.24 |
| 2026-10-04 12:00 |
15:04:48.19 |
-05:07:55.1 |
HIP 73843 |
12.58 |
| 2026-10-05 00:00 |
15:05:18.23 |
-05:10:45.5 |
HIP 73843 |
10.54 |
| 2026-10-05 12:00 |
15:05:48.37 |
-05:13:35.5 |
HIP 73843 |
13.85 |
| 2026-10-06 00:00 |
15:06:18.59 |
-05:16:25.2 |
HIP 73843 |
20.05 |
| 2026-10-06 12:00 |
15:06:48.91 |
-05:19:14.6 |
HIP 73843 |
27.23 |
| 2026-10-07 00:00 |
15:07:19.31 |
-05:22:03.5 |
HIP 74126 |
28.52 |
| 2026-10-07 12:00 |
15:07:49.79 |
-05:24:52.1 |
HIP 74126 |
20.69 |
| 2026-10-08 00:00 |
15:08:20.37 |
-05:27:40.4 |
HIP 74126 |
13.18 |
| 2026-10-08 12:00 |
15:08:51.03 |
-05:30:28.3 |
HIP 74126 |
7.13 |
| 2026-10-09 00:00 |
15:09:21.77 |
-05:33:15.7 |
HIP 74126 |
7.76 |
| 2026-10-09 12:00 |
15:09:52.60 |
-05:36:02.8 |
HIP 74188 |
13.14 |
| 2026-10-10 00:00 |
15:10:23.51 |
-05:38:49.5 |
HIP 74188 |
19.41 |
| 2026-10-10 12:00 |
15:10:54.50 |
-05:41:35.9 |
HIP 74356 |
17.76 |
| 2026-10-11 00:00 |
15:11:25.58 |
-05:44:21.8 |
HIP 74356 |
16.12 |