C/2018 S3 (TESS)
| Parameter |
Value |
| Designation |
C/2018 S3 (TESS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-06-29T12:55:24.101760Z |
| Orbit solution date (soln_date, UTC) |
2023-02-23T19:42:03Z |
| Obs used |
35 |
| NEO |
- |
| M1 |
10.400 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2018-09-22T09:14:41.107200Z |
| Discovery magnitude (MPC) |
18.80 G |
| Discovery observatory (MPC) |
C57 · TESS |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-03-08.0000000 |
| e |
1.00131593 |
| q (au) |
7.999920 |
| a (au) |
-6079.309391 |
| i (deg) |
78.418208 |
| Ω (om, deg) |
24.982385 |
| ω (w, deg) |
263.852517 |
| M (ma, deg) |
0.000523 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.026 + 4.379\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.026 |
| n |
4.379 |
| 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) |
| 2026-02-03 00:00 |
01:18:33.37 |
+14:46:22.9 |
HIP 6190 |
12.47 |
| 2026-02-03 12:00 |
01:18:35.32 |
+14:46:43.0 |
HIP 6190 |
11.97 |
| 2026-02-04 00:00 |
01:18:37.31 |
+14:47:03.4 |
HIP 6190 |
11.47 |
| 2026-02-04 12:00 |
01:18:39.35 |
+14:47:24.1 |
HIP 6190 |
10.97 |
| 2026-02-05 00:00 |
01:18:41.42 |
+14:47:45.0 |
HIP 6190 |
10.46 |
| 2026-02-05 12:00 |
01:18:43.54 |
+14:48:06.2 |
HIP 6190 |
9.96 |
| 2026-02-06 00:00 |
01:18:45.71 |
+14:48:27.6 |
HIP 6190 |
9.47 |
| 2026-02-06 12:00 |
01:18:47.91 |
+14:48:49.3 |
HIP 6190 |
8.98 |
| 2026-02-07 00:00 |
01:18:50.15 |
+14:49:11.3 |
HIP 6190 |
8.51 |
| 2026-02-07 12:00 |
01:18:52.44 |
+14:49:33.6 |
HIP 6190 |
8.05 |
| 2026-02-08 00:00 |
01:18:54.76 |
+14:49:56.1 |
HIP 6190 |
7.61 |
| 2026-02-08 12:00 |
01:18:57.13 |
+14:50:18.9 |
HIP 6190 |
7.20 |
| 2026-02-09 00:00 |
01:18:59.54 |
+14:50:41.9 |
HIP 6190 |
6.84 |
| 2026-02-09 12:00 |
01:19:01.99 |
+14:51:05.3 |
HIP 6190 |
6.52 |
| 2026-02-10 00:00 |
01:19:04.47 |
+14:51:28.8 |
HIP 6190 |
6.25 |
| 2026-02-10 12:00 |
01:19:07.00 |
+14:51:52.7 |
HIP 6190 |
6.06 |
| 2026-02-11 00:00 |
01:19:09.57 |
+14:52:16.8 |
HIP 6190 |
5.95 |
| 2026-02-11 12:00 |
01:19:12.18 |
+14:52:41.1 |
HIP 6190 |
5.93 |
| 2026-02-12 00:00 |
01:19:14.82 |
+14:53:05.8 |
HIP 6190 |
6.01 |
| 2026-02-12 12:00 |
01:19:17.50 |
+14:53:30.6 |
HIP 6190 |
6.18 |
| 2026-02-13 00:00 |
01:19:20.23 |
+14:53:55.8 |
HIP 6190 |
6.44 |
| 2026-02-13 12:00 |
01:19:22.99 |
+14:54:21.2 |
HIP 6190 |
6.78 |
| 2026-02-14 00:00 |
01:19:25.79 |
+14:54:46.8 |
HIP 6190 |
7.20 |
| 2026-02-14 12:00 |
01:19:28.62 |
+14:55:12.7 |
HIP 6190 |
7.69 |
| 2026-02-15 00:00 |
01:19:31.50 |
+14:55:38.9 |
HIP 6190 |
8.23 |
| 2026-02-15 12:00 |
01:19:34.41 |
+14:56:05.3 |
HIP 6190 |
8.82 |
| 2026-02-16 00:00 |
01:19:37.36 |
+14:56:32.0 |
HIP 6190 |
9.46 |
| 2026-02-16 12:00 |
01:19:40.34 |
+14:56:58.9 |
HIP 6190 |
10.13 |
| 2026-02-17 00:00 |
01:19:43.37 |
+14:57:26.0 |
HIP 6190 |
10.83 |
| 2026-02-17 12:00 |
01:19:46.42 |
+14:57:53.4 |
HIP 6190 |
11.57 |
| 2026-02-18 00:00 |
01:19:49.52 |
+14:58:21.1 |
HIP 6190 |
12.32 |
| 2026-02-18 12:00 |
01:19:52.65 |
+14:58:49.0 |
HIP 6190 |
13.11 |
| 2026-02-19 00:00 |
01:19:55.81 |
+14:59:17.2 |
HIP 6190 |
13.91 |
| 2026-02-19 12:00 |
01:19:59.01 |
+14:59:45.5 |
HIP 6190 |
14.73 |
| 2026-02-20 00:00 |
01:20:02.24 |
+15:00:14.2 |
HIP 6190 |
15.57 |
| 2026-02-20 12:00 |
01:20:05.51 |
+15:00:43.0 |
HIP 6190 |
16.42 |
| 2026-02-21 00:00 |
01:20:08.81 |
+15:01:12.2 |
HIP 6190 |
17.29 |
| 2026-02-21 12:00 |
01:20:12.15 |
+15:01:41.5 |
HIP 6190 |
18.18 |
| 2026-02-22 00:00 |
01:20:15.52 |
+15:02:11.1 |
HIP 6190 |
19.07 |
| 2026-02-22 12:00 |
01:20:18.92 |
+15:02:40.9 |
HIP 6190 |
19.99 |
| 2026-02-23 00:00 |
01:20:22.35 |
+15:03:10.9 |
HIP 6190 |
20.91 |
| 2026-02-23 12:00 |
01:20:25.82 |
+15:03:41.2 |
HIP 6190 |
21.85 |
| 2026-02-24 00:00 |
01:20:29.32 |
+15:04:11.7 |
HIP 6380 |
22.71 |