| Parameter |
Value |
| Designation |
C/2019 T5 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-08-01T03:25:59.563200Z |
| Orbit solution date (soln_date, UTC) |
2021-05-02T23:42:54Z |
| Obs used |
80 |
| NEO |
- |
| M1 |
14.900 |
| K1 |
9.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-10-08T14:44:47.270400Z |
| Discovery magnitude (MPC) |
18.99 o |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-11-03.0000000 |
| e |
0.80920592 |
| q (au) |
1.528889 |
| a (au) |
8.013295 |
| i (deg) |
33.422394 |
| Ω (om, deg) |
247.696368 |
| ω (w, deg) |
189.617261 |
| M (ma, deg) |
4.078062 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.884 + 4.415\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.884 |
| n |
4.415 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.996 |
| 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) |
| 2026-03-26 00:00 |
16:20:51.71 |
-24:19:48.6 |
HIP 80079 |
10.13 |
| 2026-03-26 12:00 |
16:20:48.09 |
-24:19:36.0 |
HIP 80079 |
9.71 |
| 2026-03-27 00:00 |
16:20:44.38 |
-24:19:23.3 |
HIP 80079 |
9.34 |
| 2026-03-27 12:00 |
16:20:40.59 |
-24:19:10.2 |
HIP 80079 |
9.03 |
| 2026-03-28 00:00 |
16:20:36.72 |
-24:18:57.0 |
HIP 80079 |
8.80 |
| 2026-03-28 12:00 |
16:20:32.77 |
-24:18:43.5 |
HIP 80079 |
8.66 |
| 2026-03-29 00:00 |
16:20:28.73 |
-24:18:29.8 |
HIP 80079 |
8.61 |
| 2026-03-29 12:00 |
16:20:24.62 |
-24:18:15.8 |
HIP 80079 |
8.68 |
| 2026-03-30 00:00 |
16:20:20.42 |
-24:18:01.7 |
HIP 80079 |
8.85 |
| 2026-03-30 12:00 |
16:20:16.14 |
-24:17:47.3 |
HIP 80079 |
9.14 |
| 2026-03-31 00:00 |
16:20:11.79 |
-24:17:32.6 |
HIP 80079 |
9.53 |
| 2026-03-31 12:00 |
16:20:07.35 |
-24:17:17.7 |
HIP 80079 |
10.02 |
| 2026-04-01 00:00 |
16:20:02.84 |
-24:17:02.6 |
HIP 80079 |
10.60 |
| 2026-04-01 12:00 |
16:19:58.25 |
-24:16:47.3 |
HIP 80079 |
11.26 |
| 2026-04-02 00:00 |
16:19:53.57 |
-24:16:31.7 |
HIP 80079 |
12.00 |
| 2026-04-02 12:00 |
16:19:48.83 |
-24:16:15.9 |
HIP 80079 |
12.80 |
| 2026-04-03 00:00 |
16:19:44.00 |
-24:16:00.0 |
HIP 80079 |
13.67 |
| 2026-04-03 12:00 |
16:19:39.10 |
-24:15:43.7 |
HIP 80079 |
14.58 |
| 2026-04-04 00:00 |
16:19:34.11 |
-24:15:27.2 |
HIP 80079 |
15.54 |
| 2026-04-04 12:00 |
16:19:29.06 |
-24:15:10.4 |
HIP 80079 |
16.54 |
| 2026-04-05 00:00 |
16:19:23.92 |
-24:14:53.5 |
HIP 80079 |
17.58 |
| 2026-04-05 12:00 |
16:19:18.72 |
-24:14:36.3 |
HIP 80079 |
18.66 |
| 2026-04-06 00:00 |
16:19:13.43 |
-24:14:18.9 |
HIP 80079 |
19.77 |
| 2026-04-06 12:00 |
16:19:08.08 |
-24:14:01.2 |
HIP 80079 |
20.91 |
| 2026-04-07 00:00 |
16:19:02.64 |
-24:13:43.3 |
HIP 80079 |
22.08 |
| 2026-04-07 12:00 |
16:18:57.14 |
-24:13:25.2 |
HIP 79806 |
23.09 |
| 2026-04-08 00:00 |
16:18:51.56 |
-24:13:06.9 |
HIP 79806 |
21.82 |
| 2026-04-08 12:00 |
16:18:45.91 |
-24:12:48.3 |
HIP 79806 |
20.54 |
| 2026-04-09 00:00 |
16:18:40.18 |
-24:12:29.5 |
HIP 79806 |
19.24 |
| 2026-04-09 12:00 |
16:18:34.38 |
-24:12:10.4 |
HIP 79806 |
17.94 |
| 2026-04-10 00:00 |
16:18:28.52 |
-24:11:51.2 |
HIP 79806 |
16.64 |
| 2026-04-10 12:00 |
16:18:22.58 |
-24:11:31.7 |
HIP 79806 |
15.33 |
| 2026-04-11 00:00 |
16:18:16.57 |
-24:11:11.9 |
HIP 79806 |
14.01 |
| 2026-04-11 12:00 |
16:18:10.49 |
-24:10:52.0 |
HIP 79806 |
12.71 |
| 2026-04-12 00:00 |
16:18:04.34 |
-24:10:31.8 |
HIP 79806 |
11.42 |
| 2026-04-12 12:00 |
16:17:58.13 |
-24:10:11.4 |
HIP 79806 |
10.16 |
| 2026-04-13 00:00 |
16:17:51.84 |
-24:09:50.7 |
HIP 79806 |
8.94 |
| 2026-04-13 12:00 |
16:17:45.49 |
-24:09:29.9 |
HIP 79806 |
7.80 |
| 2026-04-14 00:00 |
16:17:39.07 |
-24:09:08.8 |
HIP 79806 |
6.78 |
| 2026-04-14 12:00 |
16:17:32.58 |
-24:08:47.4 |
HIP 79806 |
5.98 |
| 2026-04-15 00:00 |
16:17:26.03 |
-24:08:25.9 |
HIP 79806 |
5.48 |
| 2026-04-15 12:00 |
16:17:19.41 |
-24:08:04.1 |
HIP 79806 |
5.39 |
| 2026-04-16 00:00 |
16:17:12.73 |
-24:07:42.1 |
HIP 79806 |
5.74 |