| Parameter |
Value |
| Designation |
C/2018 V2 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-11-26T23:28:47.184960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:46Z |
| Obs used |
173 |
| NEO |
- |
| M1 |
13.600 |
| K1 |
12.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2018-11-02T12:38:26.880000Z |
| Discovery magnitude (MPC) |
19.10 o |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-03-18.0000000 |
| e |
0.90288516 |
| q (au) |
2.474837 |
| a (au) |
25.483616 |
| i (deg) |
159.109919 |
| Ω (om, deg) |
356.790851 |
| ω (w, deg) |
318.662491 |
| M (ma, deg) |
0.850590 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.246 + 5.480\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.246 |
| n |
5.480 |
| gf |
1.000 |
| gb |
-0.951 |
| 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 |
16:58:31.63 |
-01:03:57.7 |
HIP 83031 |
8.74 |
| 2026-06-01 12:00 |
16:58:23.70 |
-01:03:43.4 |
HIP 83031 |
7.30 |
| 2026-06-02 00:00 |
16:58:15.77 |
-01:03:29.5 |
HIP 83031 |
6.18 |
| 2026-06-02 12:00 |
16:58:07.84 |
-01:03:15.8 |
HIP 83031 |
5.55 |
| 2026-06-03 00:00 |
16:57:59.90 |
-01:03:02.5 |
HIP 83031 |
5.61 |
| 2026-06-03 12:00 |
16:57:51.96 |
-01:02:49.5 |
HIP 83031 |
6.32 |
| 2026-06-04 00:00 |
16:57:44.02 |
-01:02:36.9 |
HIP 83031 |
7.51 |
| 2026-06-04 12:00 |
16:57:36.08 |
-01:02:24.6 |
HIP 83031 |
8.99 |
| 2026-06-05 00:00 |
16:57:28.13 |
-01:02:12.6 |
HIP 83031 |
10.63 |
| 2026-06-05 12:00 |
16:57:20.19 |
-01:02:00.9 |
HIP 83031 |
12.37 |
| 2026-06-06 00:00 |
16:57:12.25 |
-01:01:49.6 |
HIP 83031 |
14.18 |
| 2026-06-06 12:00 |
16:57:04.31 |
-01:01:38.6 |
HIP 83031 |
16.03 |
| 2026-06-07 00:00 |
16:56:56.37 |
-01:01:27.9 |
HIP 82849 |
17.52 |
| 2026-06-07 12:00 |
16:56:48.43 |
-01:01:17.6 |
HIP 82849 |
15.85 |
| 2026-06-08 00:00 |
16:56:40.50 |
-01:01:07.6 |
HIP 82849 |
14.25 |
| 2026-06-08 12:00 |
16:56:32.57 |
-01:00:57.9 |
HIP 82849 |
12.77 |
| 2026-06-09 00:00 |
16:56:24.65 |
-01:00:48.6 |
HIP 82849 |
11.43 |
| 2026-06-09 12:00 |
16:56:16.73 |
-01:00:39.6 |
HIP 82849 |
10.31 |
| 2026-06-10 00:00 |
16:56:08.81 |
-01:00:30.9 |
HIP 82849 |
9.46 |
| 2026-06-10 12:00 |
16:56:00.90 |
-01:00:22.6 |
HIP 82849 |
8.98 |
| 2026-06-11 00:00 |
16:55:53.00 |
-01:00:14.6 |
HIP 82849 |
8.91 |
| 2026-06-11 12:00 |
16:55:45.11 |
-01:00:07.0 |
HIP 82849 |
9.27 |
| 2026-06-12 00:00 |
16:55:37.22 |
-00:59:59.7 |
HIP 82849 |
10.01 |
| 2026-06-12 12:00 |
16:55:29.34 |
-00:59:52.7 |
HIP 82849 |
11.05 |
| 2026-06-13 00:00 |
16:55:21.47 |
-00:59:46.1 |
HIP 82849 |
12.32 |
| 2026-06-13 12:00 |
16:55:13.61 |
-00:59:39.8 |
HIP 82849 |
13.74 |
| 2026-06-14 00:00 |
16:55:05.77 |
-00:59:33.9 |
HIP 82849 |
15.29 |
| 2026-06-14 12:00 |
16:54:57.93 |
-00:59:28.3 |
HIP 82849 |
16.91 |
| 2026-06-15 00:00 |
16:54:50.10 |
-00:59:23.0 |
HIP 82849 |
18.59 |
| 2026-06-15 12:00 |
16:54:42.29 |
-00:59:18.1 |
HIP 82629 |
20.17 |
| 2026-06-16 00:00 |
16:54:34.49 |
-00:59:13.6 |
HIP 82629 |
18.46 |
| 2026-06-16 12:00 |
16:54:26.70 |
-00:59:09.4 |
HIP 82629 |
16.80 |
| 2026-06-17 00:00 |
16:54:18.93 |
-00:59:05.5 |
HIP 82629 |
15.20 |
| 2026-06-17 12:00 |
16:54:11.17 |
-00:59:02.0 |
HIP 82629 |
13.70 |
| 2026-06-18 00:00 |
16:54:03.43 |
-00:58:58.8 |
HIP 82629 |
12.32 |
| 2026-06-18 12:00 |
16:53:55.70 |
-00:58:56.0 |
HIP 82629 |
11.10 |
| 2026-06-19 00:00 |
16:53:47.99 |
-00:58:53.5 |
HIP 82629 |
10.10 |
| 2026-06-19 12:00 |
16:53:40.29 |
-00:58:51.3 |
HIP 82629 |
9.39 |
| 2026-06-20 00:00 |
16:53:32.62 |
-00:58:49.5 |
HIP 82629 |
9.04 |
| 2026-06-20 12:00 |
16:53:24.96 |
-00:58:48.0 |
HIP 82629 |
9.09 |
| 2026-06-21 00:00 |
16:53:17.32 |
-00:58:46.9 |
HIP 82629 |
9.51 |
| 2026-06-21 12:00 |
16:53:09.70 |
-00:58:46.1 |
HIP 82629 |
10.28 |
| 2026-06-22 00:00 |
16:53:02.11 |
-00:58:45.7 |
HIP 82629 |
11.31 |