| Parameter |
Value |
| Designation |
477P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-10-09T11:21:47.885760Z |
| Orbit solution date (soln_date, UTC) |
2024-04-13T16:43:16Z |
| Obs used |
320 |
| NEO |
- |
| M1 |
7.800 |
| K1 |
40.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2018-08-08T13:03:54.432000Z |
| Discovery magnitude (MPC) |
21.00 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-04-04.0000000 |
| e |
0.41596154 |
| q (au) |
1.756419 |
| a (au) |
3.007369 |
| i (deg) |
8.909359 |
| Ω (om, deg) |
59.208728 |
| ω (w, deg) |
305.889989 |
| M (ma, deg) |
33.360615 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.556 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.556 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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) |
| 2026-05-12 00:00 |
11:21:02.00 |
+13:52:35.7 |
HIP 55442 |
11.36 |
| 2026-05-12 12:00 |
11:20:58.45 |
+13:51:37.8 |
HIP 55442 |
10.75 |
| 2026-05-13 00:00 |
11:20:55.13 |
+13:50:38.4 |
HIP 55442 |
10.21 |
| 2026-05-13 12:00 |
11:20:52.04 |
+13:49:37.7 |
HIP 55442 |
9.75 |
| 2026-05-14 00:00 |
11:20:49.19 |
+13:48:35.5 |
HIP 55442 |
9.39 |
| 2026-05-14 12:00 |
11:20:46.57 |
+13:47:31.9 |
HIP 55442 |
9.12 |
| 2026-05-15 00:00 |
11:20:44.19 |
+13:46:26.8 |
HIP 55442 |
8.95 |
| 2026-05-15 12:00 |
11:20:42.04 |
+13:45:20.4 |
HIP 55442 |
8.89 |
| 2026-05-16 00:00 |
11:20:40.12 |
+13:44:12.6 |
HIP 55442 |
8.94 |
| 2026-05-16 12:00 |
11:20:38.44 |
+13:43:03.4 |
HIP 55442 |
9.10 |
| 2026-05-17 00:00 |
11:20:36.99 |
+13:41:52.8 |
HIP 55442 |
9.35 |
| 2026-05-17 12:00 |
11:20:35.77 |
+13:40:40.8 |
HIP 55442 |
9.70 |
| 2026-05-18 00:00 |
11:20:34.78 |
+13:39:27.5 |
HIP 55442 |
10.14 |
| 2026-05-18 12:00 |
11:20:34.02 |
+13:38:12.9 |
HIP 55442 |
10.66 |
| 2026-05-19 00:00 |
11:20:33.49 |
+13:36:56.9 |
HIP 55442 |
11.26 |
| 2026-05-19 12:00 |
11:20:33.20 |
+13:35:39.6 |
HIP 55442 |
11.92 |
| 2026-05-20 00:00 |
11:20:33.13 |
+13:34:20.9 |
HIP 55442 |
12.65 |
| 2026-05-20 12:00 |
11:20:33.28 |
+13:33:01.0 |
HIP 55442 |
13.44 |
| 2026-05-21 00:00 |
11:20:33.67 |
+13:31:39.8 |
HIP 55442 |
14.29 |
| 2026-05-21 12:00 |
11:20:34.28 |
+13:30:17.2 |
HIP 55442 |
15.19 |
| 2026-05-22 00:00 |
11:20:35.12 |
+13:28:53.5 |
HIP 55442 |
16.14 |
| 2026-05-22 12:00 |
11:20:36.18 |
+13:27:28.4 |
HIP 55442 |
17.14 |
| 2026-05-23 00:00 |
11:20:37.46 |
+13:26:02.1 |
HIP 55442 |
18.20 |
| 2026-05-23 12:00 |
11:20:38.97 |
+13:24:34.6 |
HIP 55442 |
19.30 |
| 2026-05-24 00:00 |
11:20:40.69 |
+13:23:05.8 |
HIP 55442 |
20.44 |
| 2026-05-24 12:00 |
11:20:42.64 |
+13:21:35.8 |
HIP 55442 |
21.64 |
| 2026-05-25 00:00 |
11:20:44.81 |
+13:20:04.6 |
HIP 55442 |
22.88 |
| 2026-05-25 12:00 |
11:20:47.19 |
+13:18:32.3 |
HIP 55442 |
24.17 |
| 2026-05-26 00:00 |
11:20:49.79 |
+13:16:58.7 |
HIP 55442 |
25.51 |
| 2026-05-26 12:00 |
11:20:52.61 |
+13:15:23.9 |
HIP 55442 |
26.89 |
| 2026-05-27 00:00 |
11:20:55.65 |
+13:13:48.0 |
HIP 55262 |
28.20 |
| 2026-05-27 12:00 |
11:20:58.89 |
+13:12:11.0 |
HIP 55262 |
29.53 |
| 2026-05-28 00:00 |
11:21:02.35 |
+13:10:32.7 |
HIP 55262 |
30.95 |
| 2026-05-28 12:00 |
11:21:06.02 |
+13:08:53.4 |
HIP 55262 |
32.48 |
| 2026-05-29 00:00 |
11:21:09.91 |
+13:07:12.9 |
HIP 55428 |
33.78 |
| 2026-05-29 12:00 |
11:21:14.00 |
+13:05:31.3 |
HIP 55428 |
32.15 |
| 2026-05-30 00:00 |
11:21:18.30 |
+13:03:48.6 |
HIP 55428 |
30.54 |
| 2026-05-30 12:00 |
11:21:22.81 |
+13:02:04.8 |
HIP 55428 |
28.98 |
| 2026-05-31 00:00 |
11:21:27.53 |
+13:00:19.9 |
HIP 55428 |
27.47 |
| 2026-05-31 12:00 |
11:21:32.45 |
+12:58:33.9 |
HIP 55428 |
26.03 |
| 2026-06-01 00:00 |
11:21:37.58 |
+12:56:46.8 |
HIP 55428 |
24.70 |
| 2026-06-01 12:00 |
11:21:42.91 |
+12:54:58.7 |
HIP 55428 |
23.50 |
| 2026-06-02 00:00 |
11:21:48.44 |
+12:53:09.5 |
HIP 55428 |
22.46 |