| 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
$$
M_a = (11.055 + 2.748\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.055 |
| n |
2.748 |
| gf |
0.931 |
| gb |
-0.938 |
| k |
1.000 |
| δ90 |
9.697 |
| 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 |
00:26:59.55 |
+09:46:36.0 |
HIP 2123 |
22.38 |
| 2026-09-20 12:00 |
00:26:49.21 |
+09:45:24.8 |
HIP 2123 |
23.54 |
| 2026-09-21 00:00 |
00:26:38.85 |
+09:44:13.2 |
HIP 2123 |
24.96 |
| 2026-09-21 12:00 |
00:26:28.47 |
+09:43:01.1 |
HIP 2118 |
24.56 |
| 2026-09-22 00:00 |
00:26:18.06 |
+09:41:48.7 |
HIP 2118 |
24.16 |
| 2026-09-22 12:00 |
00:26:07.63 |
+09:40:35.8 |
HIP 2118 |
24.09 |
| 2026-09-23 00:00 |
00:25:57.18 |
+09:39:22.4 |
HIP 2118 |
24.35 |
| 2026-09-23 12:00 |
00:25:46.72 |
+09:38:08.7 |
HIP 2118 |
24.94 |
| 2026-09-24 00:00 |
00:25:36.24 |
+09:36:54.6 |
HIP 2118 |
25.83 |
| 2026-09-24 12:00 |
00:25:25.74 |
+09:35:40.1 |
HIP 1884 |
24.59 |
| 2026-09-25 00:00 |
00:25:15.23 |
+09:34:25.3 |
HIP 1884 |
22.13 |
| 2026-09-25 12:00 |
00:25:04.70 |
+09:33:10.1 |
HIP 1884 |
19.77 |
| 2026-09-26 00:00 |
00:24:54.17 |
+09:31:54.5 |
HIP 1884 |
17.57 |
| 2026-09-26 12:00 |
00:24:43.62 |
+09:30:38.5 |
HIP 1884 |
15.59 |
| 2026-09-27 00:00 |
00:24:33.07 |
+09:29:22.3 |
HIP 1884 |
13.94 |
| 2026-09-27 12:00 |
00:24:22.51 |
+09:28:05.7 |
HIP 1884 |
12.75 |
| 2026-09-28 00:00 |
00:24:11.94 |
+09:26:48.8 |
HIP 1884 |
12.14 |
| 2026-09-28 12:00 |
00:24:01.38 |
+09:25:31.5 |
HIP 1845 |
11.26 |
| 2026-09-29 00:00 |
00:23:50.80 |
+09:24:14.0 |
HIP 1845 |
8.35 |
| 2026-09-29 12:00 |
00:23:40.23 |
+09:22:56.2 |
HIP 1845 |
5.45 |
| 2026-09-30 00:00 |
00:23:29.66 |
+09:21:38.1 |
HIP 1845 |
2.55 |
| 2026-09-30 12:00 |
00:23:19.09 |
+09:20:19.7 |
HIP 1845 |
0.62 |
| 2026-10-01 00:00 |
00:23:08.52 |
+09:19:01.1 |
HIP 1845 |
3.36 |
| 2026-10-01 12:00 |
00:22:57.96 |
+09:17:42.1 |
HIP 1845 |
6.26 |
| 2026-10-02 00:00 |
00:22:47.40 |
+09:16:23.0 |
HIP 1845 |
9.18 |
| 2026-10-02 12:00 |
00:22:36.85 |
+09:15:03.6 |
HIP 1845 |
12.09 |
| 2026-10-03 00:00 |
00:22:26.31 |
+09:13:44.0 |
HIP 1845 |
15.01 |
| 2026-10-03 12:00 |
00:22:15.78 |
+09:12:24.1 |
HIP 1845 |
17.93 |
| 2026-10-04 00:00 |
00:22:05.26 |
+09:11:04.1 |
HIP 1845 |
20.85 |
| 2026-10-04 12:00 |
00:21:54.76 |
+09:09:43.9 |
HIP 1845 |
23.77 |
| 2026-10-05 00:00 |
00:21:44.27 |
+09:08:23.4 |
HIP 1845 |
26.68 |
| 2026-10-05 12:00 |
00:21:33.79 |
+09:07:02.8 |
HIP 1845 |
29.59 |
| 2026-10-06 00:00 |
00:21:23.34 |
+09:05:42.0 |
HIP 1554 |
30.02 |
| 2026-10-06 12:00 |
00:21:12.90 |
+09:04:21.1 |
HIP 1554 |
27.34 |
| 2026-10-07 00:00 |
00:21:02.49 |
+09:03:00.0 |
HIP 1554 |
24.72 |
| 2026-10-07 12:00 |
00:20:52.10 |
+09:01:38.8 |
HIP 1554 |
22.18 |
| 2026-10-08 00:00 |
00:20:41.73 |
+09:00:17.5 |
HIP 1554 |
19.74 |
| 2026-10-08 12:00 |
00:20:31.39 |
+08:58:56.1 |
HIP 1554 |
17.44 |
| 2026-10-09 00:00 |
00:20:21.07 |
+08:57:34.5 |
HIP 1554 |
15.36 |
| 2026-10-09 12:00 |
00:20:10.79 |
+08:56:12.9 |
HIP 1554 |
13.58 |
| 2026-10-10 00:00 |
00:20:00.53 |
+08:54:51.2 |
HIP 1554 |
12.23 |
| 2026-10-10 12:00 |
00:19:50.31 |
+08:53:29.4 |
HIP 1554 |
11.47 |
| 2026-10-11 00:00 |
00:19:40.12 |
+08:52:07.6 |
HIP 1554 |
11.40 |