| 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 |
0.999 |
| gb |
-1.000 |
| k |
0.800 |
| δ90 |
9.986 |
| 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 |
01:37:51.98 |
+18:28:34.0 |
HIP 7571 |
12.86 |
| 2026-07-29 12:00 |
01:37:50.81 |
+18:28:56.2 |
HIP 7571 |
12.41 |
| 2026-07-30 00:00 |
01:37:49.59 |
+18:29:18.2 |
HIP 7571 |
11.97 |
| 2026-07-30 12:00 |
01:37:48.32 |
+18:29:39.9 |
HIP 7571 |
11.53 |
| 2026-07-31 00:00 |
01:37:47.01 |
+18:30:01.4 |
HIP 7571 |
11.09 |
| 2026-07-31 12:00 |
01:37:45.65 |
+18:30:22.6 |
HIP 7571 |
10.65 |
| 2026-08-01 00:00 |
01:37:44.24 |
+18:30:43.5 |
HIP 7571 |
10.22 |
| 2026-08-01 12:00 |
01:37:42.79 |
+18:31:04.2 |
HIP 7571 |
9.79 |
| 2026-08-02 00:00 |
01:37:41.29 |
+18:31:24.6 |
HIP 7571 |
9.37 |
| 2026-08-02 12:00 |
01:37:39.75 |
+18:31:44.8 |
HIP 7571 |
8.97 |
| 2026-08-03 00:00 |
01:37:38.16 |
+18:32:04.7 |
HIP 7571 |
8.57 |
| 2026-08-03 12:00 |
01:37:36.52 |
+18:32:24.4 |
HIP 7571 |
8.19 |
| 2026-08-04 00:00 |
01:37:34.84 |
+18:32:43.8 |
HIP 7571 |
7.82 |
| 2026-08-04 12:00 |
01:37:33.12 |
+18:33:02.9 |
HIP 7571 |
7.48 |
| 2026-08-05 00:00 |
01:37:31.34 |
+18:33:21.8 |
HIP 7571 |
7.16 |
| 2026-08-05 12:00 |
01:37:29.52 |
+18:33:40.4 |
HIP 7571 |
6.87 |
| 2026-08-06 00:00 |
01:37:27.66 |
+18:33:58.7 |
HIP 7571 |
6.62 |
| 2026-08-06 12:00 |
01:37:25.75 |
+18:34:16.8 |
HIP 7571 |
6.41 |
| 2026-08-07 00:00 |
01:37:23.79 |
+18:34:34.6 |
HIP 7571 |
6.25 |
| 2026-08-07 12:00 |
01:37:21.79 |
+18:34:52.2 |
HIP 7571 |
6.15 |
| 2026-08-08 00:00 |
01:37:19.74 |
+18:35:09.4 |
HIP 7571 |
6.10 |
| 2026-08-08 12:00 |
01:37:17.65 |
+18:35:26.5 |
HIP 7571 |
6.11 |
| 2026-08-09 00:00 |
01:37:15.51 |
+18:35:43.2 |
HIP 7571 |
6.19 |
| 2026-08-09 12:00 |
01:37:13.33 |
+18:35:59.7 |
HIP 7571 |
6.33 |
| 2026-08-10 00:00 |
01:37:11.10 |
+18:36:15.9 |
HIP 7571 |
6.53 |
| 2026-08-10 12:00 |
01:37:08.82 |
+18:36:31.8 |
HIP 7571 |
6.79 |
| 2026-08-11 00:00 |
01:37:06.50 |
+18:36:47.5 |
HIP 7571 |
7.10 |
| 2026-08-11 12:00 |
01:37:04.14 |
+18:37:02.9 |
HIP 7571 |
7.46 |
| 2026-08-12 00:00 |
01:37:01.73 |
+18:37:18.0 |
HIP 7571 |
7.86 |
| 2026-08-12 12:00 |
01:36:59.27 |
+18:37:32.9 |
HIP 7571 |
8.30 |
| 2026-08-13 00:00 |
01:36:56.77 |
+18:37:47.4 |
HIP 7571 |
8.78 |
| 2026-08-13 12:00 |
01:36:54.23 |
+18:38:01.7 |
HIP 7571 |
9.29 |
| 2026-08-14 00:00 |
01:36:51.64 |
+18:38:15.8 |
HIP 7571 |
9.82 |
| 2026-08-14 12:00 |
01:36:49.01 |
+18:38:29.5 |
HIP 7571 |
10.38 |
| 2026-08-15 00:00 |
01:36:46.33 |
+18:38:43.0 |
HIP 7571 |
10.97 |
| 2026-08-15 12:00 |
01:36:43.61 |
+18:38:56.2 |
HIP 7571 |
11.57 |
| 2026-08-16 00:00 |
01:36:40.84 |
+18:39:09.1 |
HIP 7571 |
12.19 |
| 2026-08-16 12:00 |
01:36:38.03 |
+18:39:21.8 |
HIP 7571 |
12.83 |
| 2026-08-17 00:00 |
01:36:35.18 |
+18:39:34.2 |
HIP 7571 |
13.49 |
| 2026-08-17 12:00 |
01:36:32.28 |
+18:39:46.3 |
HIP 7571 |
14.16 |
| 2026-08-18 00:00 |
01:36:29.35 |
+18:39:58.1 |
HIP 7571 |
14.85 |
| 2026-08-18 12:00 |
01:36:26.36 |
+18:40:09.7 |
HIP 7571 |
15.55 |
| 2026-08-19 00:00 |
01:36:23.34 |
+18:40:21.0 |
HIP 7571 |
16.26 |