| Parameter |
Value |
| Designation |
C/2019 M4 (TESS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-09-10T05:31:11.516160Z |
| Orbit solution date (soln_date, UTC) |
2023-05-11T17:42:03Z |
| Obs used |
88 |
| NEO |
- |
| M1 |
4.600 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-06-27T02:44:30.768000Z |
| Discovery magnitude (MPC) |
18.90 G |
| Discovery observatory (MPC) |
C57 · TESS |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-09-26.0000000 |
| e |
1.00453441 |
| q (au) |
9.181017 |
| a (au) |
-2024.743895 |
| i (deg) |
65.710801 |
| Ω (om, deg) |
52.573407 |
| ω (w, deg) |
260.252031 |
| M (ma, deg) |
0.000171 |
Magnitude
Scatter + Global Linear
$$
M_a = (-1.188 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
-1.188 |
| n |
6.000 |
| gf |
0.976 |
| gb |
-0.774 |
| k |
1.000 |
| 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) |
| 2026-06-01 00:00 |
03:13:38.23 |
+01:39:47.6 |
HIP 15008 |
14.15 |
| 2026-06-01 12:00 |
03:13:44.79 |
+01:40:30.2 |
HIP 15008 |
15.23 |
| 2026-06-02 00:00 |
03:13:51.34 |
+01:41:12.5 |
HIP 15008 |
16.44 |
| 2026-06-02 12:00 |
03:13:57.86 |
+01:41:54.5 |
HIP 15008 |
17.73 |
| 2026-06-03 00:00 |
03:14:04.37 |
+01:42:36.2 |
HIP 15008 |
19.09 |
| 2026-06-03 12:00 |
03:14:10.86 |
+01:43:17.6 |
HIP 15008 |
20.51 |
| 2026-06-04 00:00 |
03:14:17.33 |
+01:43:58.7 |
HIP 15168 |
18.80 |
| 2026-06-04 12:00 |
03:14:23.78 |
+01:44:39.5 |
HIP 15168 |
17.10 |
| 2026-06-05 00:00 |
03:14:30.21 |
+01:45:20.0 |
HIP 15168 |
15.41 |
| 2026-06-05 12:00 |
03:14:36.62 |
+01:46:00.2 |
HIP 15168 |
13.73 |
| 2026-06-06 00:00 |
03:14:43.01 |
+01:46:40.1 |
HIP 15168 |
12.09 |
| 2026-06-06 12:00 |
03:14:49.38 |
+01:47:19.6 |
HIP 15168 |
10.47 |
| 2026-06-07 00:00 |
03:14:55.72 |
+01:47:58.9 |
HIP 15168 |
8.90 |
| 2026-06-07 12:00 |
03:15:02.05 |
+01:48:37.8 |
HIP 15168 |
7.39 |
| 2026-06-08 00:00 |
03:15:08.35 |
+01:49:16.5 |
HIP 15168 |
6.01 |
| 2026-06-08 12:00 |
03:15:14.63 |
+01:49:54.8 |
HIP 15168 |
4.82 |
| 2026-06-09 00:00 |
03:15:20.88 |
+01:50:32.8 |
HIP 15168 |
4.03 |
| 2026-06-09 12:00 |
03:15:27.12 |
+01:51:10.6 |
HIP 15168 |
3.85 |
| 2026-06-10 00:00 |
03:15:33.32 |
+01:51:48.0 |
HIP 15168 |
4.36 |
| 2026-06-10 12:00 |
03:15:39.51 |
+01:52:25.1 |
HIP 15168 |
5.36 |
| 2026-06-11 00:00 |
03:15:45.67 |
+01:53:01.8 |
HIP 15168 |
6.62 |
| 2026-06-11 12:00 |
03:15:51.81 |
+01:53:38.3 |
HIP 15168 |
8.02 |
| 2026-06-12 00:00 |
03:15:57.92 |
+01:54:14.5 |
HIP 15168 |
9.50 |
| 2026-06-12 12:00 |
03:16:04.00 |
+01:54:50.3 |
HIP 15168 |
11.01 |
| 2026-06-13 00:00 |
03:16:10.06 |
+01:55:25.8 |
HIP 15168 |
12.54 |
| 2026-06-13 12:00 |
03:16:16.09 |
+01:56:01.1 |
HIP 15168 |
14.09 |
| 2026-06-14 00:00 |
03:16:22.09 |
+01:56:35.9 |
HIP 15168 |
15.64 |
| 2026-06-14 12:00 |
03:16:28.07 |
+01:57:10.5 |
HIP 15168 |
17.19 |
| 2026-06-15 00:00 |
03:16:34.02 |
+01:57:44.8 |
HIP 15168 |
18.75 |
| 2026-06-15 12:00 |
03:16:39.94 |
+01:58:18.7 |
HIP 15168 |
20.30 |
| 2026-06-16 00:00 |
03:16:45.84 |
+01:58:52.4 |
HIP 15264 |
21.58 |
| 2026-06-16 12:00 |
03:16:51.70 |
+01:59:25.7 |
HIP 15264 |
20.94 |
| 2026-06-17 00:00 |
03:16:57.53 |
+01:59:58.7 |
HIP 15264 |
20.41 |
| 2026-06-17 12:00 |
03:17:03.34 |
+02:00:31.4 |
HIP 15264 |
19.99 |
| 2026-06-18 00:00 |
03:17:09.11 |
+02:01:03.7 |
HIP 15264 |
19.69 |
| 2026-06-18 12:00 |
03:17:14.86 |
+02:01:35.8 |
HIP 15264 |
19.50 |
| 2026-06-19 00:00 |
03:17:20.57 |
+02:02:07.5 |
HIP 15264 |
19.44 |
| 2026-06-19 12:00 |
03:17:26.25 |
+02:02:38.9 |
HIP 15264 |
19.50 |
| 2026-06-20 00:00 |
03:17:31.90 |
+02:03:10.0 |
HIP 15264 |
19.68 |
| 2026-06-20 12:00 |
03:17:37.52 |
+02:03:40.7 |
HIP 15264 |
19.97 |
| 2026-06-21 00:00 |
03:17:43.11 |
+02:04:11.2 |
HIP 15264 |
20.36 |
| 2026-06-21 12:00 |
03:17:48.66 |
+02:04:41.3 |
HIP 15264 |
20.86 |
| 2026-06-22 00:00 |
03:17:54.18 |
+02:05:11.2 |
HIP 15436 |
20.43 |