C/2019 N1 (ATLAS)
| Parameter |
Value |
| Designation |
C/2019 N1 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-12-01T19:23:19.812480Z |
| Orbit solution date (soln_date, UTC) |
2023-02-06T22:12:27Z |
| Obs used |
1994 |
| 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) |
2020-04-21.0000000 |
| e |
0.99987024 |
| q (au) |
1.704628 |
| a (au) |
13136.683803 |
| i (deg) |
82.424794 |
| Ω (om, deg) |
13.576713 |
| ω (w, deg) |
193.445407 |
| M (ma, deg) |
359.999853 |
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 |
+2.0406 |
-1.471 |
| 2020-03-24 |
2020-11-29 |
-0.0339 |
-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) |
| 2026-02-03 00:00 |
01:04:34.88 |
-19:41:40.2 |
HIP 5093 |
13.18 |
| 2026-02-03 12:00 |
01:04:38.05 |
-19:40:24.0 |
HIP 5093 |
13.67 |
| 2026-02-04 00:00 |
01:04:41.26 |
-19:39:07.8 |
HIP 5093 |
14.29 |
| 2026-02-04 12:00 |
01:04:44.53 |
-19:37:51.6 |
HIP 5093 |
15.03 |
| 2026-02-05 00:00 |
01:04:47.85 |
-19:36:35.4 |
HIP 5093 |
15.87 |
| 2026-02-05 12:00 |
01:04:51.23 |
-19:35:19.1 |
HIP 5159 |
16.79 |
| 2026-02-06 00:00 |
01:04:54.65 |
-19:34:02.9 |
HIP 5159 |
16.03 |
| 2026-02-06 12:00 |
01:04:58.13 |
-19:32:46.6 |
HIP 5159 |
15.37 |
| 2026-02-07 00:00 |
01:05:01.66 |
-19:31:30.4 |
HIP 5159 |
14.82 |
| 2026-02-07 12:00 |
01:05:05.24 |
-19:30:14.2 |
HIP 5159 |
14.40 |
| 2026-02-08 00:00 |
01:05:08.87 |
-19:28:58.0 |
HIP 5159 |
14.12 |
| 2026-02-08 12:00 |
01:05:12.55 |
-19:27:41.8 |
HIP 5159 |
14.00 |
| 2026-02-09 00:00 |
01:05:16.28 |
-19:26:25.6 |
HIP 5159 |
14.03 |
| 2026-02-09 12:00 |
01:05:20.06 |
-19:25:09.4 |
HIP 5159 |
14.22 |
| 2026-02-10 00:00 |
01:05:23.89 |
-19:23:53.3 |
HIP 5159 |
14.57 |
| 2026-02-10 12:00 |
01:05:27.77 |
-19:22:37.2 |
HIP 5159 |
15.07 |
| 2026-02-11 00:00 |
01:05:31.70 |
-19:21:21.2 |
HIP 5159 |
15.70 |
| 2026-02-11 12:00 |
01:05:35.67 |
-19:20:05.2 |
HIP 5159 |
16.45 |
| 2026-02-12 00:00 |
01:05:39.70 |
-19:18:49.2 |
HIP 5159 |
17.30 |
| 2026-02-12 12:00 |
01:05:43.77 |
-19:17:33.3 |
HIP 5159 |
18.26 |
| 2026-02-13 00:00 |
01:05:47.88 |
-19:16:17.4 |
HIP 5159 |
19.29 |
| 2026-02-13 12:00 |
01:05:52.04 |
-19:15:01.6 |
HIP 5159 |
20.39 |
| 2026-02-14 00:00 |
01:05:56.25 |
-19:13:45.8 |
HIP 5159 |
21.55 |
| 2026-02-14 12:00 |
01:06:00.51 |
-19:12:30.1 |
HIP 5174 |
22.32 |
| 2026-02-15 00:00 |
01:06:04.81 |
-19:11:14.5 |
HIP 5174 |
20.97 |
| 2026-02-15 12:00 |
01:06:09.16 |
-19:09:59.0 |
HIP 5174 |
19.67 |
| 2026-02-16 00:00 |
01:06:13.55 |
-19:08:43.5 |
HIP 5174 |
18.42 |
| 2026-02-16 12:00 |
01:06:17.98 |
-19:07:28.1 |
HIP 5174 |
17.24 |
| 2026-02-17 00:00 |
01:06:22.46 |
-19:06:12.8 |
HIP 5174 |
16.14 |
| 2026-02-17 12:00 |
01:06:26.98 |
-19:04:57.6 |
HIP 5174 |
15.14 |
| 2026-02-18 00:00 |
01:06:31.54 |
-19:03:42.5 |
HIP 5174 |
14.27 |
| 2026-02-18 12:00 |
01:06:36.15 |
-19:02:27.4 |
HIP 5174 |
13.55 |
| 2026-02-19 00:00 |
01:06:40.80 |
-19:01:12.5 |
HIP 5174 |
13.01 |
| 2026-02-19 12:00 |
01:06:45.49 |
-18:59:57.7 |
HIP 5174 |
12.67 |
| 2026-02-20 00:00 |
01:06:50.22 |
-18:58:43.0 |
HIP 5174 |
12.56 |
| 2026-02-20 12:00 |
01:06:54.99 |
-18:57:28.4 |
HIP 5174 |
12.68 |
| 2026-02-21 00:00 |
01:06:59.81 |
-18:56:13.9 |
HIP 5174 |
13.03 |
| 2026-02-21 12:00 |
01:07:04.66 |
-18:54:59.5 |
HIP 5174 |
13.59 |
| 2026-02-22 00:00 |
01:07:09.55 |
-18:53:45.3 |
HIP 5174 |
14.34 |
| 2026-02-22 12:00 |
01:07:14.48 |
-18:52:31.2 |
HIP 5174 |
15.24 |
| 2026-02-23 00:00 |
01:07:19.45 |
-18:51:17.2 |
HIP 5174 |
16.29 |
| 2026-02-23 12:00 |
01:07:24.46 |
-18:50:03.4 |
HIP 5174 |
17.45 |
| 2026-02-24 00:00 |
01:07:29.50 |
-18:48:49.7 |
HIP 5174 |
18.70 |