| Parameter |
Value |
| Designation |
377P/Scotti |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-07-10T01:54:37.517760Z |
| Orbit solution date (soln_date, UTC) |
2022-07-06T03:13:02Z |
| Obs used |
192 |
| NEO |
- |
| M1 |
12.300 |
| K1 |
6.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-03-09T02:38:12.768000Z |
| Discovery magnitude (MPC) |
20.30 G |
| Discovery observatory (MPC) |
J04 · ESA Optical Ground Station, Tenerife |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-07-04.0000000 |
| e |
0.25147638 |
| q (au) |
5.036392 |
| a (au) |
6.728435 |
| i (deg) |
9.016997 |
| Ω (om, deg) |
226.030194 |
| ω (w, deg) |
354.469351 |
| M (ma, deg) |
235.870097 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.033 + 2.762\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.033 |
| n |
2.762 |
| gf |
0.905 |
| gb |
-0.938 |
| k |
1.000 |
| δ90 |
9.615 |
| 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 |
00:21:21.04 |
+08:27:08.7 |
HIP 1645 |
19.30 |
| 2026-05-12 12:00 |
00:21:34.34 |
+08:28:40.2 |
HIP 1645 |
22.52 |
| 2026-05-13 00:00 |
00:21:47.59 |
+08:30:11.4 |
HIP 1816 |
22.73 |
| 2026-05-13 12:00 |
00:22:00.77 |
+08:31:42.3 |
HIP 1816 |
19.23 |
| 2026-05-14 00:00 |
00:22:13.89 |
+08:33:13.0 |
HIP 1816 |
15.79 |
| 2026-05-14 12:00 |
00:22:26.95 |
+08:34:43.3 |
HIP 1816 |
12.44 |
| 2026-05-15 00:00 |
00:22:39.94 |
+08:36:13.3 |
HIP 1816 |
9.27 |
| 2026-05-15 12:00 |
00:22:52.87 |
+08:37:43.1 |
HIP 1816 |
6.50 |
| 2026-05-16 00:00 |
00:23:05.74 |
+08:39:12.5 |
HIP 1816 |
4.85 |
| 2026-05-16 12:00 |
00:23:18.55 |
+08:40:41.7 |
HIP 1816 |
5.42 |
| 2026-05-17 00:00 |
00:23:31.29 |
+08:42:10.5 |
HIP 1816 |
7.71 |
| 2026-05-17 12:00 |
00:23:43.96 |
+08:43:39.0 |
HIP 1816 |
10.65 |
| 2026-05-18 00:00 |
00:23:56.57 |
+08:45:07.1 |
HIP 1816 |
13.81 |
| 2026-05-18 12:00 |
00:24:09.11 |
+08:46:35.0 |
HIP 1816 |
17.07 |
| 2026-05-19 00:00 |
00:24:21.59 |
+08:48:02.5 |
HIP 1816 |
20.36 |
| 2026-05-19 12:00 |
00:24:33.99 |
+08:49:29.6 |
HIP 1998 |
18.36 |
| 2026-05-20 00:00 |
00:24:46.33 |
+08:50:56.5 |
HIP 1998 |
15.43 |
| 2026-05-20 12:00 |
00:24:58.60 |
+08:52:23.0 |
HIP 1998 |
12.75 |
| 2026-05-21 00:00 |
00:25:10.80 |
+08:53:49.1 |
HIP 1998 |
10.47 |
| 2026-05-21 12:00 |
00:25:22.93 |
+08:55:14.9 |
HIP 1998 |
8.88 |
| 2026-05-22 00:00 |
00:25:35.00 |
+08:56:40.3 |
HIP 1998 |
8.38 |
| 2026-05-22 12:00 |
00:25:46.99 |
+08:58:05.4 |
HIP 1998 |
9.13 |
| 2026-05-23 00:00 |
00:25:58.91 |
+08:59:30.1 |
HIP 1998 |
10.84 |
| 2026-05-23 12:00 |
00:26:10.75 |
+09:00:54.4 |
HIP 1998 |
13.14 |
| 2026-05-24 00:00 |
00:26:22.53 |
+09:02:18.4 |
HIP 2154 |
14.40 |
| 2026-05-24 12:00 |
00:26:34.23 |
+09:03:42.0 |
HIP 2154 |
11.20 |
| 2026-05-25 00:00 |
00:26:45.86 |
+09:05:05.2 |
HIP 2154 |
8.04 |
| 2026-05-25 12:00 |
00:26:57.42 |
+09:06:28.1 |
HIP 2154 |
4.92 |
| 2026-05-26 00:00 |
00:27:08.90 |
+09:07:50.6 |
HIP 2154 |
1.98 |
| 2026-05-26 12:00 |
00:27:20.31 |
+09:09:12.7 |
HIP 2154 |
1.85 |
| 2026-05-27 00:00 |
00:27:31.64 |
+09:10:34.4 |
HIP 2154 |
4.73 |
| 2026-05-27 12:00 |
00:27:42.90 |
+09:11:55.7 |
HIP 2154 |
7.77 |
| 2026-05-28 00:00 |
00:27:54.09 |
+09:13:16.6 |
HIP 2154 |
10.82 |
| 2026-05-28 12:00 |
00:28:05.19 |
+09:14:37.1 |
HIP 2154 |
13.86 |
| 2026-05-29 00:00 |
00:28:16.22 |
+09:15:57.2 |
HIP 2154 |
16.88 |
| 2026-05-29 12:00 |
00:28:27.18 |
+09:17:16.9 |
HIP 2154 |
19.88 |
| 2026-05-30 00:00 |
00:28:38.05 |
+09:18:36.2 |
HIP 2154 |
22.87 |
| 2026-05-30 12:00 |
00:28:48.85 |
+09:19:55.1 |
HIP 2154 |
25.84 |
| 2026-05-31 00:00 |
00:28:59.57 |
+09:21:13.6 |
HIP 2332 |
24.20 |
| 2026-05-31 12:00 |
00:29:10.21 |
+09:22:31.7 |
HIP 2332 |
21.78 |
| 2026-06-01 00:00 |
00:29:20.77 |
+09:23:49.3 |
HIP 2332 |
19.51 |
| 2026-06-01 12:00 |
00:29:31.25 |
+09:25:06.5 |
HIP 2332 |
17.44 |
| 2026-06-02 00:00 |
00:29:41.65 |
+09:26:23.3 |
HIP 2332 |
15.64 |