| Parameter |
Value |
| Designation |
C/2019 N1 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-12-01T19:23:18.896640Z |
| Orbit solution date (soln_date, UTC) |
2026-03-11T21:13:02Z |
| Obs used |
1995 |
| 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 |
0.99987028 |
| q (au) |
1.704628 |
| a (au) |
13141.158862 |
| i (deg) |
82.424795 |
| Ω (om, deg) |
13.576714 |
| ω (w, deg) |
193.445399 |
| 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 |
+2.0405 |
-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) |
| 2026-06-01 00:00 |
01:26:54.78 |
-16:28:23.7 |
HIP 6716 |
7.63 |
| 2026-06-01 12:00 |
01:26:59.16 |
-16:28:21.8 |
HIP 6716 |
8.60 |
| 2026-06-02 00:00 |
01:27:03.50 |
-16:28:20.4 |
HIP 6716 |
9.58 |
| 2026-06-02 12:00 |
01:27:07.79 |
-16:28:19.5 |
HIP 6716 |
10.56 |
| 2026-06-03 00:00 |
01:27:12.05 |
-16:28:19.1 |
HIP 6716 |
11.53 |
| 2026-06-03 12:00 |
01:27:16.26 |
-16:28:19.1 |
HIP 6716 |
12.50 |
| 2026-06-04 00:00 |
01:27:20.43 |
-16:28:19.7 |
HIP 6716 |
13.46 |
| 2026-06-04 12:00 |
01:27:24.56 |
-16:28:20.7 |
HIP 6716 |
14.42 |
| 2026-06-05 00:00 |
01:27:28.65 |
-16:28:22.1 |
HIP 6716 |
15.37 |
| 2026-06-05 12:00 |
01:27:32.69 |
-16:28:24.1 |
HIP 6716 |
16.31 |
| 2026-06-06 00:00 |
01:27:36.69 |
-16:28:26.5 |
HIP 6716 |
17.24 |
| 2026-06-06 12:00 |
01:27:40.65 |
-16:28:29.4 |
HIP 6716 |
18.16 |
| 2026-06-07 00:00 |
01:27:44.56 |
-16:28:32.8 |
HIP 6716 |
19.08 |
| 2026-06-07 12:00 |
01:27:48.43 |
-16:28:36.6 |
HIP 6716 |
19.98 |
| 2026-06-08 00:00 |
01:27:52.26 |
-16:28:40.9 |
HIP 6716 |
20.88 |
| 2026-06-08 12:00 |
01:27:56.04 |
-16:28:45.7 |
HIP 6716 |
21.77 |
| 2026-06-09 00:00 |
01:27:59.78 |
-16:28:51.0 |
HIP 6716 |
22.64 |
| 2026-06-09 12:00 |
01:28:03.47 |
-16:28:56.7 |
HIP 6716 |
23.51 |
| 2026-06-10 00:00 |
01:28:07.11 |
-16:29:03.0 |
HIP 6716 |
24.37 |
| 2026-06-10 12:00 |
01:28:10.71 |
-16:29:09.7 |
HIP 6716 |
25.21 |
| 2026-06-11 00:00 |
01:28:14.27 |
-16:29:16.8 |
HIP 6716 |
26.05 |
| 2026-06-11 12:00 |
01:28:17.77 |
-16:29:24.4 |
HIP 6716 |
26.87 |
| 2026-06-12 00:00 |
01:28:21.23 |
-16:29:32.5 |
HIP 6951 |
27.10 |
| 2026-06-12 12:00 |
01:28:24.65 |
-16:29:41.1 |
HIP 6951 |
26.72 |
| 2026-06-13 00:00 |
01:28:28.01 |
-16:29:50.2 |
HIP 6951 |
26.38 |
| 2026-06-13 12:00 |
01:28:31.33 |
-16:29:59.7 |
HIP 6951 |
26.07 |
| 2026-06-14 00:00 |
01:28:34.60 |
-16:30:09.7 |
HIP 6951 |
25.80 |
| 2026-06-14 12:00 |
01:28:37.82 |
-16:30:20.1 |
HIP 6951 |
25.56 |
| 2026-06-15 00:00 |
01:28:40.99 |
-16:30:31.0 |
HIP 6951 |
25.35 |
| 2026-06-15 12:00 |
01:28:44.11 |
-16:30:42.4 |
HIP 6951 |
25.18 |
| 2026-06-16 00:00 |
01:28:47.19 |
-16:30:54.2 |
HIP 6951 |
25.04 |
| 2026-06-16 12:00 |
01:28:50.21 |
-16:31:06.5 |
HIP 6951 |
24.94 |
| 2026-06-17 00:00 |
01:28:53.19 |
-16:31:19.3 |
HIP 6951 |
24.88 |
| 2026-06-17 12:00 |
01:28:56.11 |
-16:31:32.5 |
HIP 6951 |
24.84 |
| 2026-06-18 00:00 |
01:28:58.98 |
-16:31:46.2 |
HIP 6951 |
24.84 |
| 2026-06-18 12:00 |
01:29:01.81 |
-16:32:00.4 |
HIP 6951 |
24.87 |
| 2026-06-19 00:00 |
01:29:04.58 |
-16:32:15.0 |
HIP 6951 |
24.93 |
| 2026-06-19 12:00 |
01:29:07.30 |
-16:32:30.0 |
HIP 6951 |
25.02 |
| 2026-06-20 00:00 |
01:29:09.97 |
-16:32:45.5 |
HIP 6951 |
25.14 |
| 2026-06-20 12:00 |
01:29:12.59 |
-16:33:01.4 |
HIP 6951 |
25.29 |
| 2026-06-21 00:00 |
01:29:15.16 |
-16:33:17.8 |
HIP 6951 |
25.46 |
| 2026-06-21 12:00 |
01:29:17.67 |
-16:33:34.7 |
HIP 6951 |
25.66 |
| 2026-06-22 00:00 |
01:29:20.13 |
-16:33:52.0 |
HIP 6951 |
25.89 |