| 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) |
| 2026-07-29 00:00 |
11:50:01.00 |
+08:00:41.3 |
HIP 57686 |
14.85 |
| 2026-07-29 12:00 |
11:50:22.89 |
+07:57:36.5 |
HIP 57686 |
14.04 |
| 2026-07-30 00:00 |
11:50:44.88 |
+07:54:31.4 |
HIP 57686 |
15.87 |
| 2026-07-30 12:00 |
11:51:06.94 |
+07:51:25.9 |
HIP 57686 |
19.65 |
| 2026-07-31 00:00 |
11:51:29.10 |
+07:48:20.1 |
HIP 57924 |
22.81 |
| 2026-07-31 12:00 |
11:51:51.34 |
+07:45:14.0 |
HIP 57924 |
16.50 |
| 2026-08-01 00:00 |
11:52:13.66 |
+07:42:07.6 |
HIP 57924 |
10.18 |
| 2026-08-01 12:00 |
11:52:36.07 |
+07:39:00.9 |
HIP 57924 |
3.90 |
| 2026-08-02 00:00 |
11:52:58.56 |
+07:35:53.8 |
HIP 57924 |
2.84 |
| 2026-08-02 12:00 |
11:53:21.13 |
+07:32:46.4 |
HIP 57924 |
9.10 |
| 2026-08-03 00:00 |
11:53:43.79 |
+07:29:38.8 |
HIP 57924 |
15.50 |
| 2026-08-03 12:00 |
11:54:06.53 |
+07:26:30.8 |
HIP 57924 |
21.94 |
| 2026-08-04 00:00 |
11:54:29.34 |
+07:23:22.6 |
HIP 57924 |
28.40 |
| 2026-08-04 12:00 |
11:54:52.24 |
+07:20:14.0 |
HIP 58165 |
31.16 |
| 2026-08-05 00:00 |
11:55:15.22 |
+07:17:05.2 |
HIP 58165 |
26.26 |
| 2026-08-05 12:00 |
11:55:38.27 |
+07:13:56.1 |
HIP 58165 |
22.20 |
| 2026-08-06 00:00 |
11:56:01.40 |
+07:10:46.6 |
HIP 58165 |
19.53 |
| 2026-08-06 12:00 |
11:56:24.62 |
+07:07:37.0 |
HIP 58165 |
18.88 |
| 2026-08-07 00:00 |
11:56:47.90 |
+07:04:27.0 |
HIP 58329 |
15.40 |
| 2026-08-07 12:00 |
11:57:11.27 |
+07:01:16.8 |
HIP 58329 |
8.85 |
| 2026-08-08 00:00 |
11:57:34.71 |
+06:58:06.3 |
HIP 58329 |
2.61 |
| 2026-08-08 12:00 |
11:57:58.22 |
+06:54:55.5 |
HIP 58329 |
4.82 |
| 2026-08-09 00:00 |
11:58:21.81 |
+06:51:44.5 |
HIP 58329 |
11.33 |
| 2026-08-09 12:00 |
11:58:45.48 |
+06:48:33.3 |
HIP 58473 |
11.71 |
| 2026-08-10 00:00 |
11:59:09.21 |
+06:45:21.7 |
HIP 58473 |
9.47 |
| 2026-08-10 12:00 |
11:59:33.02 |
+06:42:10.0 |
HIP 58473 |
11.50 |
| 2026-08-11 00:00 |
11:59:56.90 |
+06:38:58.0 |
HIP 58590 |
13.94 |
| 2026-08-11 12:00 |
12:00:20.86 |
+06:35:45.7 |
HIP 58590 |
7.91 |
| 2026-08-12 00:00 |
12:00:44.88 |
+06:32:33.3 |
HIP 58590 |
4.70 |
| 2026-08-12 12:00 |
12:01:08.97 |
+06:29:20.6 |
HIP 58638 |
4.76 |
| 2026-08-13 00:00 |
12:01:33.13 |
+06:26:07.7 |
HIP 58638 |
4.44 |
| 2026-08-13 12:00 |
12:01:57.36 |
+06:22:54.6 |
HIP 58638 |
10.48 |
| 2026-08-14 00:00 |
12:02:21.66 |
+06:19:41.3 |
HIP 58638 |
17.14 |
| 2026-08-14 12:00 |
12:02:46.02 |
+06:16:27.7 |
HIP 58638 |
23.91 |
| 2026-08-15 00:00 |
12:03:10.45 |
+06:13:14.0 |
HIP 58638 |
30.74 |
| 2026-08-15 12:00 |
12:03:34.94 |
+06:10:00.1 |
HIP 58958 |
27.05 |
| 2026-08-16 00:00 |
12:03:59.50 |
+06:06:46.0 |
HIP 58958 |
21.85 |
| 2026-08-16 12:00 |
12:04:24.12 |
+06:03:31.7 |
HIP 58958 |
17.85 |
| 2026-08-17 00:00 |
12:04:48.80 |
+06:00:17.2 |
HIP 58958 |
15.98 |
| 2026-08-17 12:00 |
12:05:13.55 |
+05:57:02.6 |
HIP 58958 |
16.98 |
| 2026-08-18 00:00 |
12:05:38.36 |
+05:53:47.8 |
HIP 59080 |
20.18 |
| 2026-08-18 12:00 |
12:06:03.23 |
+05:50:32.8 |
HIP 59080 |
13.42 |
| 2026-08-19 00:00 |
12:06:28.15 |
+05:47:17.7 |
HIP 59080 |
7.08 |