| Parameter |
Value |
| Designation |
P/2021 N1 (ZTF) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-06-06T13:17:58.335360Z |
| Orbit solution date (soln_date, UTC) |
2022-10-07T00:43:31Z |
| Obs used |
96 |
| NEO |
Yes |
| M1 |
17.800 |
| K1 |
21.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-07-02T11:08:00.096000Z |
| Discovery magnitude (MPC) |
18.94 r |
| Discovery observatory (MPC) |
I41 · Palomar Mountain–ZTF |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2021-07-07.0000000 |
| e |
0.67679260 |
| q (au) |
0.962147 |
| a (au) |
2.976871 |
| i (deg) |
11.505610 |
| Ω (om, deg) |
301.158449 |
| ω (w, deg) |
21.189770 |
| M (ma, deg) |
5.842413 |
Magnitude
Scatter + Global Linear
$$
M_a = (17.269 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
17.269 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
20:13:11.57 |
-51:25:28.3 |
HIP 99344 |
36.17 |
| 2026-06-01 12:00 |
20:16:53.40 |
-51:22:10.7 |
HIP 100126 |
18.87 |
| 2026-06-02 00:00 |
20:20:39.18 |
-51:18:16.9 |
HIP 100126 |
21.84 |
| 2026-06-02 12:00 |
20:24:28.92 |
-51:13:44.8 |
HIP 100569 |
8.67 |
| 2026-06-03 00:00 |
20:28:22.63 |
-51:08:32.5 |
HIP 101048 |
7.31 |
| 2026-06-03 12:00 |
20:32:20.32 |
-51:02:38.0 |
HIP 101169 |
21.25 |
| 2026-06-04 00:00 |
20:36:21.97 |
-50:55:59.1 |
HIP 101574 |
17.41 |
| 2026-06-04 12:00 |
20:40:27.58 |
-50:48:33.6 |
HIP 101929 |
14.34 |
| 2026-06-05 00:00 |
20:44:37.11 |
-50:40:19.1 |
HIP 102405 |
11.12 |
| 2026-06-05 12:00 |
20:48:50.53 |
-50:31:13.4 |
HIP 102586 |
14.10 |
| 2026-06-06 00:00 |
20:53:07.79 |
-50:21:13.9 |
HIP 103063 |
10.34 |
| 2026-06-06 12:00 |
20:57:28.84 |
-50:10:18.2 |
HIP 103408 |
21.23 |
| 2026-06-07 00:00 |
21:01:53.60 |
-49:58:23.6 |
HIP 103805 |
5.25 |
| 2026-06-07 12:00 |
21:06:21.98 |
-49:45:27.6 |
HIP 104191 |
12.50 |
| 2026-06-08 00:00 |
21:10:53.90 |
-49:31:27.3 |
HIP 104545 |
9.57 |
| 2026-06-08 12:00 |
21:15:29.25 |
-49:16:20.0 |
HIP 104976 |
3.72 |
| 2026-06-09 00:00 |
21:20:07.90 |
-49:00:02.8 |
HIP 105281 |
13.46 |
| 2026-06-09 12:00 |
21:24:49.71 |
-48:42:33.0 |
HIP 105897 |
24.57 |
| 2026-06-10 00:00 |
21:29:34.56 |
-48:23:47.6 |
HIP 106076 |
24.21 |
| 2026-06-10 12:00 |
21:34:22.26 |
-48:03:43.7 |
HIP 106652 |
19.11 |
| 2026-06-11 00:00 |
21:39:12.65 |
-47:42:18.3 |
HIP 107057 |
18.95 |
| 2026-06-11 12:00 |
21:44:05.55 |
-47:19:28.7 |
HIP 107405 |
15.14 |
| 2026-06-12 00:00 |
21:49:00.75 |
-46:55:11.7 |
HIP 107701 |
2.14 |
| 2026-06-12 12:00 |
21:53:58.06 |
-46:29:24.7 |
HIP 108207 |
24.05 |
| 2026-06-13 00:00 |
21:58:57.25 |
-46:02:04.7 |
HIP 108386 |
17.69 |
| 2026-06-13 12:00 |
22:03:58.10 |
-45:33:09.1 |
HIP 108987 |
9.11 |
| 2026-06-14 00:00 |
22:09:00.37 |
-45:02:35.2 |
HIP 109292 |
19.99 |
| 2026-06-14 12:00 |
22:14:03.82 |
-44:30:20.5 |
HIP 109782 |
12.56 |
| 2026-06-15 00:00 |
22:19:08.21 |
-43:56:22.7 |
HIP 110271 |
27.80 |
| 2026-06-15 12:00 |
22:24:13.29 |
-43:20:39.4 |
HIP 110519 |
9.63 |
| 2026-06-16 00:00 |
22:29:18.79 |
-42:43:08.7 |
HIP 111182 |
23.54 |
| 2026-06-16 12:00 |
22:34:24.47 |
-42:03:48.8 |
HIP 111372 |
6.96 |
| 2026-06-17 00:00 |
22:39:30.07 |
-41:22:38.2 |
HIP 112001 |
18.96 |
| 2026-06-17 12:00 |
22:44:35.34 |
-40:39:35.6 |
HIP 112301 |
7.00 |
| 2026-06-18 00:00 |
22:49:40.01 |
-39:54:40.2 |
HIP 112681 |
7.05 |
| 2026-06-18 12:00 |
22:54:43.85 |
-39:07:51.3 |
HIP 113034 |
22.40 |
| 2026-06-19 00:00 |
22:59:46.61 |
-38:19:08.7 |
HIP 113428 |
17.09 |
| 2026-06-19 12:00 |
23:04:48.06 |
-37:28:32.6 |
HIP 113912 |
9.25 |
| 2026-06-20 00:00 |
23:09:47.95 |
-36:36:03.8 |
HIP 114439 |
13.77 |
| 2026-06-20 12:00 |
23:14:46.08 |
-35:41:43.2 |
HIP 114801 |
6.85 |
| 2026-06-21 00:00 |
23:19:42.22 |
-34:45:32.6 |
HIP 115094 |
16.28 |
| 2026-06-21 12:00 |
23:24:36.18 |
-33:47:33.9 |
HIP 115536 |
21.01 |
| 2026-06-22 00:00 |
23:29:27.77 |
-32:47:49.9 |
HIP 116077 |
28.40 |