| 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) |
| 2026-06-01 00:00 |
01:35:12.93 |
+17:21:53.1 |
HIP 7447 |
10.78 |
| 2026-06-01 12:00 |
01:35:16.48 |
+17:22:36.7 |
HIP 7447 |
9.73 |
| 2026-06-02 00:00 |
01:35:19.99 |
+17:23:20.2 |
HIP 7447 |
8.70 |
| 2026-06-02 12:00 |
01:35:23.48 |
+17:24:03.6 |
HIP 7447 |
7.70 |
| 2026-06-03 00:00 |
01:35:26.93 |
+17:24:46.9 |
HIP 7447 |
6.73 |
| 2026-06-03 12:00 |
01:35:30.36 |
+17:25:30.0 |
HIP 7447 |
5.82 |
| 2026-06-04 00:00 |
01:35:33.75 |
+17:26:13.1 |
HIP 7447 |
4.99 |
| 2026-06-04 12:00 |
01:35:37.12 |
+17:26:56.1 |
HIP 7447 |
4.28 |
| 2026-06-05 00:00 |
01:35:40.45 |
+17:27:38.9 |
HIP 7447 |
3.76 |
| 2026-06-05 12:00 |
01:35:43.75 |
+17:28:21.7 |
HIP 7447 |
3.50 |
| 2026-06-06 00:00 |
01:35:47.02 |
+17:29:04.3 |
HIP 7447 |
3.55 |
| 2026-06-06 12:00 |
01:35:50.26 |
+17:29:46.8 |
HIP 7447 |
3.90 |
| 2026-06-07 00:00 |
01:35:53.46 |
+17:30:29.2 |
HIP 7447 |
4.47 |
| 2026-06-07 12:00 |
01:35:56.63 |
+17:31:11.5 |
HIP 7447 |
5.19 |
| 2026-06-08 00:00 |
01:35:59.77 |
+17:31:53.7 |
HIP 7447 |
5.99 |
| 2026-06-08 12:00 |
01:36:02.88 |
+17:32:35.7 |
HIP 7447 |
6.85 |
| 2026-06-09 00:00 |
01:36:05.95 |
+17:33:17.7 |
HIP 7447 |
7.75 |
| 2026-06-09 12:00 |
01:36:08.99 |
+17:33:59.4 |
HIP 7447 |
8.67 |
| 2026-06-10 00:00 |
01:36:12.00 |
+17:34:41.1 |
HIP 7447 |
9.59 |
| 2026-06-10 12:00 |
01:36:14.97 |
+17:35:22.7 |
HIP 7447 |
10.53 |
| 2026-06-11 00:00 |
01:36:17.91 |
+17:36:04.1 |
HIP 7447 |
11.47 |
| 2026-06-11 12:00 |
01:36:20.81 |
+17:36:45.3 |
HIP 7447 |
12.41 |
| 2026-06-12 00:00 |
01:36:23.68 |
+17:37:26.5 |
HIP 7447 |
13.35 |
| 2026-06-12 12:00 |
01:36:26.51 |
+17:38:07.5 |
HIP 7447 |
14.28 |
| 2026-06-13 00:00 |
01:36:29.31 |
+17:38:48.4 |
HIP 7447 |
15.22 |
| 2026-06-13 12:00 |
01:36:32.07 |
+17:39:29.1 |
HIP 7447 |
16.14 |
| 2026-06-14 00:00 |
01:36:34.80 |
+17:40:09.7 |
HIP 7447 |
17.07 |
| 2026-06-14 12:00 |
01:36:37.49 |
+17:40:50.2 |
HIP 7447 |
17.99 |
| 2026-06-15 00:00 |
01:36:40.15 |
+17:41:30.5 |
HIP 7447 |
18.90 |
| 2026-06-15 12:00 |
01:36:42.76 |
+17:42:10.6 |
HIP 7447 |
19.81 |
| 2026-06-16 00:00 |
01:36:45.35 |
+17:42:50.7 |
HIP 7447 |
20.71 |
| 2026-06-16 12:00 |
01:36:47.89 |
+17:43:30.5 |
HIP 7626 |
21.45 |
| 2026-06-17 00:00 |
01:36:50.40 |
+17:44:10.3 |
HIP 7626 |
20.69 |
| 2026-06-17 12:00 |
01:36:52.86 |
+17:44:49.8 |
HIP 7626 |
19.95 |
| 2026-06-18 00:00 |
01:36:55.30 |
+17:45:29.2 |
HIP 7626 |
19.23 |
| 2026-06-18 12:00 |
01:36:57.69 |
+17:46:08.5 |
HIP 7626 |
18.53 |
| 2026-06-19 00:00 |
01:37:00.05 |
+17:46:47.6 |
HIP 7626 |
17.86 |
| 2026-06-19 12:00 |
01:37:02.36 |
+17:47:26.5 |
HIP 7626 |
17.22 |
| 2026-06-20 00:00 |
01:37:04.64 |
+17:48:05.3 |
HIP 7626 |
16.60 |
| 2026-06-20 12:00 |
01:37:06.88 |
+17:48:44.0 |
HIP 7626 |
16.01 |
| 2026-06-21 00:00 |
01:37:09.08 |
+17:49:22.4 |
HIP 7626 |
15.46 |
| 2026-06-21 12:00 |
01:37:11.25 |
+17:50:00.7 |
HIP 7626 |
14.94 |
| 2026-06-22 00:00 |
01:37:13.37 |
+17:50:38.9 |
HIP 7626 |
14.46 |