C/2019 JU6 (ATLAS)
| Parameter |
Value |
| Designation |
C/2019 JU6 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-06-01T01:29:57.295680Z |
| Orbit solution date (soln_date, UTC) |
2022-06-20T23:12:34Z |
| Obs used |
76 |
| NEO |
- |
| M1 |
14.500 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-05-19.0000000 |
| e |
0.99939729 |
| q (au) |
2.045767 |
| a (au) |
3394.271759 |
| i (deg) |
148.291676 |
| Ω (om, deg) |
21.701965 |
| ω (w, deg) |
94.917780 |
| M (ma, deg) |
359.999935 |
Magnitude
Scatter + Global Linear
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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 |
09:35:38.54 |
-14:23:32.1 |
HIP 47066 |
18.05 |
| 2026-02-03 12:00 |
09:35:31.02 |
-14:23:08.7 |
HIP 47066 |
18.33 |
| 2026-02-04 00:00 |
09:35:23.48 |
-14:22:44.9 |
HIP 47066 |
18.80 |
| 2026-02-04 12:00 |
09:35:15.94 |
-14:22:20.7 |
HIP 47066 |
19.44 |
| 2026-02-05 00:00 |
09:35:08.40 |
-14:21:55.9 |
HIP 47066 |
20.25 |
| 2026-02-05 12:00 |
09:35:00.85 |
-14:21:30.7 |
HIP 47066 |
21.20 |
| 2026-02-06 00:00 |
09:34:53.30 |
-14:21:05.0 |
HIP 47066 |
22.27 |
| 2026-02-06 12:00 |
09:34:45.74 |
-14:20:38.8 |
HIP 47066 |
23.45 |
| 2026-02-07 00:00 |
09:34:38.18 |
-14:20:12.2 |
HIP 47066 |
24.73 |
| 2026-02-07 12:00 |
09:34:30.61 |
-14:19:45.1 |
HIP 47066 |
26.09 |
| 2026-02-08 00:00 |
09:34:23.05 |
-14:19:17.6 |
HIP 46973 |
27.29 |
| 2026-02-08 12:00 |
09:34:15.48 |
-14:18:49.5 |
HIP 46973 |
26.94 |
| 2026-02-09 00:00 |
09:34:07.91 |
-14:18:21.1 |
HIP 46855 |
25.47 |
| 2026-02-09 12:00 |
09:34:00.34 |
-14:17:52.1 |
HIP 46855 |
23.87 |
| 2026-02-10 00:00 |
09:33:52.78 |
-14:17:22.8 |
HIP 46855 |
22.31 |
| 2026-02-10 12:00 |
09:33:45.21 |
-14:16:52.9 |
HIP 46855 |
20.80 |
| 2026-02-11 00:00 |
09:33:37.65 |
-14:16:22.7 |
HIP 46855 |
19.35 |
| 2026-02-11 12:00 |
09:33:30.09 |
-14:15:52.0 |
HIP 46855 |
17.98 |
| 2026-02-12 00:00 |
09:33:22.53 |
-14:15:20.8 |
HIP 46855 |
16.71 |
| 2026-02-12 12:00 |
09:33:14.97 |
-14:14:49.2 |
HIP 46855 |
15.56 |
| 2026-02-13 00:00 |
09:33:07.42 |
-14:14:17.2 |
HIP 46855 |
14.57 |
| 2026-02-13 12:00 |
09:32:59.88 |
-14:13:44.7 |
HIP 46855 |
13.76 |
| 2026-02-14 00:00 |
09:32:52.34 |
-14:13:11.8 |
HIP 46855 |
13.17 |
| 2026-02-14 12:00 |
09:32:44.80 |
-14:12:38.5 |
HIP 46855 |
12.84 |
| 2026-02-15 00:00 |
09:32:37.27 |
-14:12:04.7 |
HIP 46855 |
12.77 |
| 2026-02-15 12:00 |
09:32:29.75 |
-14:11:30.6 |
HIP 46855 |
12.99 |
| 2026-02-16 00:00 |
09:32:22.24 |
-14:10:56.0 |
HIP 46855 |
13.47 |
| 2026-02-16 12:00 |
09:32:14.74 |
-14:10:21.0 |
HIP 46855 |
14.18 |
| 2026-02-17 00:00 |
09:32:07.25 |
-14:09:45.6 |
HIP 46855 |
15.10 |
| 2026-02-17 12:00 |
09:31:59.76 |
-14:09:09.8 |
HIP 46855 |
16.18 |
| 2026-02-18 00:00 |
09:31:52.29 |
-14:08:33.5 |
HIP 46855 |
17.41 |
| 2026-02-18 12:00 |
09:31:44.83 |
-14:07:56.9 |
HIP 46855 |
18.74 |
| 2026-02-19 00:00 |
09:31:37.38 |
-14:07:19.9 |
HIP 46855 |
20.16 |
| 2026-02-19 12:00 |
09:31:29.95 |
-14:06:42.5 |
HIP 46855 |
21.65 |
| 2026-02-20 00:00 |
09:31:22.52 |
-14:06:04.7 |
HIP 46855 |
23.20 |
| 2026-02-20 12:00 |
09:31:15.12 |
-14:05:26.5 |
HIP 46855 |
24.79 |
| 2026-02-21 00:00 |
09:31:07.72 |
-14:04:48.0 |
HIP 46855 |
26.42 |
| 2026-02-21 12:00 |
09:31:00.34 |
-14:04:09.0 |
HIP 46855 |
28.09 |
| 2026-02-22 00:00 |
09:30:52.98 |
-14:03:29.7 |
HIP 46855 |
29.77 |
| 2026-02-22 12:00 |
09:30:45.63 |
-14:02:50.1 |
HIP 46519 |
28.41 |
| 2026-02-23 00:00 |
09:30:38.30 |
-14:02:10.0 |
HIP 46519 |
26.64 |
| 2026-02-23 12:00 |
09:30:30.99 |
-14:01:29.6 |
HIP 46519 |
24.89 |
| 2026-02-24 00:00 |
09:30:23.70 |
-14:00:48.9 |
HIP 46519 |
23.15 |