| Parameter |
Value |
| Designation |
P/2021 N1 (ZTF) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2026-07-28T11:57:15.727680Z |
| Orbit solution date (soln_date, UTC) |
2026-10-01T13:12:08Z |
| Obs used |
401 |
| NEO |
Yes |
| M1 |
19.200 |
| K1 |
4.500 |
| 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) |
2025-07-27.0000000 |
| e |
0.67585203 |
| q (au) |
0.966137 |
| a (au) |
2.980543 |
| i (deg) |
11.484366 |
| Ω (om, deg) |
301.120298 |
| ω (w, deg) |
21.224427 |
| M (ma, deg) |
289.800729 |
Magnitude
Scatter + Global Linear
$$
M_a = (19.521 + 2.348\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
19.521 |
| n |
2.348 |
| gf |
0.800 |
| gb |
-0.515 |
| k |
0.800 |
| δ90 |
1.000 |
| 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) |
| 2026-09-25 00:00 |
05:07:53.44 |
+47:11:18.6 |
HIP 23684 |
29.77 |
| 2026-09-25 12:00 |
05:07:59.30 |
+47:13:56.8 |
HIP 23684 |
32.08 |
| 2026-09-26 00:00 |
05:08:03.98 |
+47:16:32.1 |
HIP 24109 |
32.92 |
| 2026-09-26 12:00 |
05:08:07.47 |
+47:19:04.6 |
HIP 24109 |
33.96 |
| 2026-09-27 00:00 |
05:08:09.76 |
+47:21:34.1 |
HIP 24109 |
35.28 |
| 2026-09-27 12:00 |
05:08:10.85 |
+47:24:00.6 |
HIP 24077 |
34.63 |
| 2026-09-28 00:00 |
05:08:10.73 |
+47:26:24.1 |
HIP 24077 |
32.83 |
| 2026-09-28 12:00 |
05:08:09.40 |
+47:28:44.6 |
HIP 24077 |
31.29 |
| 2026-09-29 00:00 |
05:08:06.85 |
+47:31:02.1 |
HIP 24077 |
30.04 |
| 2026-09-29 12:00 |
05:08:03.08 |
+47:33:16.3 |
HIP 24077 |
29.13 |
| 2026-09-30 00:00 |
05:07:58.09 |
+47:35:27.4 |
HIP 24077 |
28.57 |
| 2026-09-30 12:00 |
05:07:51.86 |
+47:37:35.3 |
HIP 24077 |
28.41 |
| 2026-10-01 00:00 |
05:07:44.40 |
+47:39:39.9 |
HIP 24077 |
28.66 |
| 2026-10-01 12:00 |
05:07:35.70 |
+47:41:41.1 |
HIP 24077 |
29.33 |
| 2026-10-02 00:00 |
05:07:25.75 |
+47:43:38.9 |
HIP 24077 |
30.40 |
| 2026-10-02 12:00 |
05:07:14.56 |
+47:45:33.2 |
HIP 24077 |
31.86 |
| 2026-10-03 00:00 |
05:07:02.12 |
+47:47:24.0 |
HIP 23569 |
31.04 |
| 2026-10-03 12:00 |
05:06:48.42 |
+47:49:11.1 |
HIP 23569 |
29.32 |
| 2026-10-04 00:00 |
05:06:33.47 |
+47:50:54.5 |
HIP 23569 |
27.58 |
| 2026-10-04 12:00 |
05:06:17.26 |
+47:52:34.1 |
HIP 23569 |
25.87 |
| 2026-10-05 00:00 |
05:05:59.79 |
+47:54:09.8 |
HIP 23569 |
24.26 |
| 2026-10-05 12:00 |
05:05:41.07 |
+47:55:41.5 |
HIP 23569 |
22.82 |
| 2026-10-06 00:00 |
05:05:21.08 |
+47:57:09.1 |
HIP 23569 |
21.67 |
| 2026-10-06 12:00 |
05:04:59.84 |
+47:58:32.6 |
HIP 23569 |
20.95 |
| 2026-10-07 00:00 |
05:04:37.34 |
+47:59:51.8 |
HIP 23569 |
20.78 |
| 2026-10-07 12:00 |
05:04:13.59 |
+48:01:06.6 |
HIP 23569 |
21.29 |
| 2026-10-08 00:00 |
05:03:48.59 |
+48:02:16.9 |
HIP 23569 |
22.52 |
| 2026-10-08 12:00 |
05:03:22.34 |
+48:03:22.6 |
HIP 23569 |
24.46 |
| 2026-10-09 00:00 |
05:02:54.85 |
+48:04:23.6 |
HIP 23569 |
27.04 |
| 2026-10-09 12:00 |
05:02:26.12 |
+48:05:19.9 |
HIP 23569 |
30.19 |
| 2026-10-10 00:00 |
05:01:56.17 |
+48:06:11.2 |
HIP 23569 |
33.82 |
| 2026-10-10 12:00 |
05:01:24.99 |
+48:06:57.4 |
HIP 23104 |
31.69 |
| 2026-10-11 00:00 |
05:00:52.60 |
+48:07:38.6 |
HIP 23104 |
26.43 |
| 2026-10-11 12:00 |
05:00:19.00 |
+48:08:14.4 |
HIP 23104 |
21.06 |
| 2026-10-12 00:00 |
04:59:44.21 |
+48:08:44.9 |
HIP 23104 |
15.65 |
| 2026-10-12 12:00 |
04:59:08.23 |
+48:09:09.9 |
HIP 23104 |
10.49 |
| 2026-10-13 00:00 |
04:58:31.07 |
+48:09:29.3 |
HIP 23104 |
6.74 |
| 2026-10-13 12:00 |
04:57:52.76 |
+48:09:42.9 |
HIP 23104 |
7.64 |
| 2026-10-14 00:00 |
04:57:13.29 |
+48:09:50.7 |
HIP 23104 |
12.48 |
| 2026-10-14 12:00 |
04:56:32.69 |
+48:09:52.6 |
HIP 23024 |
17.96 |
| 2026-10-15 00:00 |
04:55:50.97 |
+48:09:48.4 |
HIP 23024 |
21.05 |
| 2026-10-15 12:00 |
04:55:08.14 |
+48:09:38.0 |
HIP 22764 |
17.86 |
| 2026-10-16 00:00 |
04:54:24.22 |
+48:09:21.3 |
HIP 22764 |
13.24 |