C/2019 M4 (TESS)
| 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
$$
M_a = (-1.187 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
-1.187 |
| n |
6.000 |
| gf |
0.965 |
| gb |
-0.974 |
| k |
1.000 |
| δ90 |
9.950 |
| 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 |
02:53:48.16 |
-02:37:34.3 |
HIP 13452 |
11.74 |
| 2026-02-03 12:00 |
02:53:48.30 |
-02:36:26.0 |
HIP 13452 |
12.55 |
| 2026-02-04 00:00 |
02:53:48.50 |
-02:35:17.6 |
HIP 13452 |
13.41 |
| 2026-02-04 12:00 |
02:53:48.76 |
-02:34:09.0 |
HIP 13452 |
14.33 |
| 2026-02-05 00:00 |
02:53:49.09 |
-02:33:00.2 |
HIP 13452 |
15.29 |
| 2026-02-05 12:00 |
02:53:49.48 |
-02:31:51.1 |
HIP 13452 |
16.28 |
| 2026-02-06 00:00 |
02:53:49.93 |
-02:30:42.0 |
HIP 13452 |
17.31 |
| 2026-02-06 12:00 |
02:53:50.45 |
-02:29:32.6 |
HIP 13452 |
18.36 |
| 2026-02-07 00:00 |
02:53:51.03 |
-02:28:23.0 |
HIP 13497 |
18.10 |
| 2026-02-07 12:00 |
02:53:51.67 |
-02:27:13.3 |
HIP 13497 |
16.95 |
| 2026-02-08 00:00 |
02:53:52.38 |
-02:26:03.4 |
HIP 13497 |
15.79 |
| 2026-02-08 12:00 |
02:53:53.15 |
-02:24:53.4 |
HIP 13497 |
14.63 |
| 2026-02-09 00:00 |
02:53:53.98 |
-02:23:43.2 |
HIP 13497 |
13.47 |
| 2026-02-09 12:00 |
02:53:54.87 |
-02:22:32.8 |
HIP 13497 |
12.32 |
| 2026-02-10 00:00 |
02:53:55.83 |
-02:21:22.2 |
HIP 13497 |
11.18 |
| 2026-02-10 12:00 |
02:53:56.85 |
-02:20:11.5 |
HIP 13497 |
10.06 |
| 2026-02-11 00:00 |
02:53:57.93 |
-02:19:00.7 |
HIP 13497 |
8.95 |
| 2026-02-11 12:00 |
02:53:59.07 |
-02:17:49.7 |
HIP 13497 |
7.88 |
| 2026-02-12 00:00 |
02:54:00.28 |
-02:16:38.5 |
HIP 13497 |
6.86 |
| 2026-02-12 12:00 |
02:54:01.54 |
-02:15:27.3 |
HIP 13497 |
5.92 |
| 2026-02-13 00:00 |
02:54:02.87 |
-02:14:15.8 |
HIP 13497 |
5.11 |
| 2026-02-13 12:00 |
02:54:04.26 |
-02:13:04.3 |
HIP 13497 |
4.52 |
| 2026-02-14 00:00 |
02:54:05.71 |
-02:11:52.6 |
HIP 13497 |
4.23 |
| 2026-02-14 12:00 |
02:54:07.22 |
-02:10:40.8 |
HIP 13497 |
4.31 |
| 2026-02-15 00:00 |
02:54:08.79 |
-02:09:28.8 |
HIP 13497 |
4.76 |
| 2026-02-15 12:00 |
02:54:10.43 |
-02:08:16.7 |
HIP 13497 |
5.48 |
| 2026-02-16 00:00 |
02:54:12.12 |
-02:07:04.5 |
HIP 13497 |
6.38 |
| 2026-02-16 12:00 |
02:54:13.87 |
-02:05:52.2 |
HIP 13497 |
7.41 |
| 2026-02-17 00:00 |
02:54:15.68 |
-02:04:39.8 |
HIP 13497 |
8.52 |
| 2026-02-17 12:00 |
02:54:17.56 |
-02:03:27.3 |
HIP 13497 |
9.69 |
| 2026-02-18 00:00 |
02:54:19.49 |
-02:02:14.6 |
HIP 13497 |
10.90 |
| 2026-02-18 12:00 |
02:54:21.48 |
-02:01:01.9 |
HIP 13497 |
12.14 |
| 2026-02-19 00:00 |
02:54:23.53 |
-01:59:49.1 |
HIP 13497 |
13.40 |
| 2026-02-19 12:00 |
02:54:25.64 |
-01:58:36.1 |
HIP 13497 |
14.68 |
| 2026-02-20 00:00 |
02:54:27.81 |
-01:57:23.1 |
HIP 13497 |
15.98 |
| 2026-02-20 12:00 |
02:54:30.03 |
-01:56:10.0 |
HIP 13497 |
17.30 |
| 2026-02-21 00:00 |
02:54:32.31 |
-01:54:56.8 |
HIP 13497 |
18.62 |
| 2026-02-21 12:00 |
02:54:34.65 |
-01:53:43.5 |
HIP 13497 |
19.96 |
| 2026-02-22 00:00 |
02:54:37.05 |
-01:52:30.2 |
HIP 13478 |
20.89 |
| 2026-02-22 12:00 |
02:54:39.51 |
-01:51:16.7 |
HIP 13478 |
20.56 |
| 2026-02-23 00:00 |
02:54:42.02 |
-01:50:03.2 |
HIP 13478 |
20.33 |
| 2026-02-23 12:00 |
02:54:44.59 |
-01:48:49.6 |
HIP 13478 |
20.21 |
| 2026-02-24 00:00 |
02:54:47.21 |
-01:47:36.0 |
HIP 13478 |
20.19 |