| Parameter |
Value |
| Designation |
C/2019 N1 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-12-01T19:23:16.494720Z |
| Orbit solution date (soln_date, UTC) |
2026-07-28T14:12:16Z |
| Obs used |
1998 |
| NEO |
- |
| M1 |
11.100 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-07-05T12:59:27.196800Z |
| Discovery magnitude (MPC) |
18.68 o |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-04-22.0000000 |
| e |
0.99987061 |
| q (au) |
1.704628 |
| a (au) |
13174.772352 |
| i (deg) |
82.424805 |
| Ω (om, deg) |
13.576685 |
| ω (w, deg) |
193.445419 |
| M (ma, deg) |
359.999854 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.769 + 2.574\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.769 |
| n |
2.574 |
| gf |
1.000 |
| gb |
-0.684 |
| k |
0.800 |
| δ90 |
9.991 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2019-06-10 |
2020-03-24 |
+2.0405 |
-1.471 |
| 2020-03-24 |
2020-11-29 |
-0.0335 |
-0.168 |
| 2020-12-03 |
2022-09-01 |
+3.3483 |
-1.177 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
01:21:24.78 |
-18:38:05.6 |
HIP 6425 |
18.13 |
| 2026-09-20 12:00 |
01:21:17.76 |
-18:38:48.0 |
HIP 6425 |
19.15 |
| 2026-09-21 00:00 |
01:21:10.71 |
-18:39:30.1 |
HIP 6425 |
20.29 |
| 2026-09-21 12:00 |
01:21:03.64 |
-18:40:12.0 |
HIP 6425 |
21.53 |
| 2026-09-22 00:00 |
01:20:56.55 |
-18:40:53.5 |
HIP 6425 |
22.85 |
| 2026-09-22 12:00 |
01:20:49.43 |
-18:41:34.8 |
HIP 6425 |
24.25 |
| 2026-09-23 00:00 |
01:20:42.28 |
-18:42:15.7 |
HIP 6425 |
25.70 |
| 2026-09-23 12:00 |
01:20:35.11 |
-18:42:56.3 |
HIP 6425 |
27.21 |
| 2026-09-24 00:00 |
01:20:27.92 |
-18:43:36.6 |
HIP 6425 |
28.75 |
| 2026-09-24 12:00 |
01:20:20.71 |
-18:44:16.6 |
HIP 6425 |
30.34 |
| 2026-09-25 00:00 |
01:20:13.48 |
-18:44:56.3 |
HIP 6425 |
31.96 |
| 2026-09-25 12:00 |
01:20:06.22 |
-18:45:35.6 |
HIP 6425 |
33.60 |
| 2026-09-26 00:00 |
01:19:58.95 |
-18:46:14.6 |
HIP 6052 |
32.26 |
| 2026-09-26 12:00 |
01:19:51.65 |
-18:46:53.3 |
HIP 6052 |
30.57 |
| 2026-09-27 00:00 |
01:19:44.34 |
-18:47:31.6 |
HIP 6052 |
28.89 |
| 2026-09-27 12:00 |
01:19:37.01 |
-18:48:09.5 |
HIP 6052 |
27.24 |
| 2026-09-28 00:00 |
01:19:29.66 |
-18:48:47.2 |
HIP 6052 |
25.60 |
| 2026-09-28 12:00 |
01:19:22.29 |
-18:49:24.4 |
HIP 6052 |
23.99 |
| 2026-09-29 00:00 |
01:19:14.91 |
-18:50:01.4 |
HIP 6052 |
22.42 |
| 2026-09-29 12:00 |
01:19:07.51 |
-18:50:37.9 |
HIP 6052 |
20.88 |
| 2026-09-30 00:00 |
01:19:00.09 |
-18:51:14.1 |
HIP 6052 |
19.39 |
| 2026-09-30 12:00 |
01:18:52.66 |
-18:51:49.9 |
HIP 6052 |
17.97 |
| 2026-10-01 00:00 |
01:18:45.22 |
-18:52:25.3 |
HIP 6052 |
16.63 |
| 2026-10-01 12:00 |
01:18:37.76 |
-18:53:00.4 |
HIP 6052 |
15.39 |
| 2026-10-02 00:00 |
01:18:30.28 |
-18:53:35.1 |
HIP 6052 |
14.27 |
| 2026-10-02 12:00 |
01:18:22.80 |
-18:54:09.4 |
HIP 6052 |
13.32 |
| 2026-10-03 00:00 |
01:18:15.30 |
-18:54:43.3 |
HIP 6052 |
12.57 |
| 2026-10-03 12:00 |
01:18:07.79 |
-18:55:16.8 |
HIP 6052 |
12.05 |
| 2026-10-04 00:00 |
01:18:00.27 |
-18:55:49.9 |
HIP 6019 |
11.09 |
| 2026-10-04 12:00 |
01:17:52.74 |
-18:56:22.6 |
HIP 6019 |
9.30 |
| 2026-10-05 00:00 |
01:17:45.20 |
-18:56:54.9 |
HIP 6019 |
7.55 |
| 2026-10-05 12:00 |
01:17:37.66 |
-18:57:26.8 |
HIP 6019 |
5.87 |
| 2026-10-06 00:00 |
01:17:30.10 |
-18:57:58.3 |
HIP 6019 |
4.34 |
| 2026-10-06 12:00 |
01:17:22.54 |
-18:58:29.3 |
HIP 6019 |
3.20 |
| 2026-10-07 00:00 |
01:17:14.97 |
-18:59:00.0 |
HIP 6019 |
2.93 |
| 2026-10-07 12:00 |
01:17:07.39 |
-18:59:30.2 |
HIP 6019 |
3.73 |
| 2026-10-08 00:00 |
01:16:59.81 |
-19:00:00.0 |
HIP 6019 |
5.12 |
| 2026-10-08 12:00 |
01:16:52.22 |
-19:00:29.3 |
HIP 6019 |
6.74 |
| 2026-10-09 00:00 |
01:16:44.63 |
-19:00:58.2 |
HIP 6019 |
8.46 |
| 2026-10-09 12:00 |
01:16:37.04 |
-19:01:26.6 |
HIP 6019 |
10.23 |
| 2026-10-10 00:00 |
01:16:29.44 |
-19:01:54.6 |
HIP 6019 |
12.03 |
| 2026-10-10 12:00 |
01:16:21.85 |
-19:02:22.2 |
HIP 6019 |
13.84 |
| 2026-10-11 00:00 |
01:16:14.25 |
-19:02:49.3 |
HIP 6019 |
15.66 |