| Parameter |
Value |
| Designation |
C/2022 F2 (NEOWISE) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-03-23T11:03:25.447680Z |
| Orbit solution date (soln_date, UTC) |
2022-08-26T23:42:58Z |
| Obs used |
108 |
| NEO |
- |
| M1 |
15.800 |
| K1 |
4.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2022-03-30T17:17:39.840000Z |
| Discovery magnitude (MPC) |
17.00 R |
| Discovery observatory (MPC) |
C51 · WISE |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-04-15.0000000 |
| e |
0.93379045 |
| q (au) |
1.585007 |
| a (au) |
23.939247 |
| i (deg) |
97.293167 |
| Ω (om, deg) |
58.694002 |
| ω (w, deg) |
200.628782 |
| M (ma, deg) |
0.189661 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.560 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.560 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.848 |
| k |
0.800 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
04:03:48.38 |
+05:39:36.3 |
HIP 18953 |
3.63 |
| 2026-05-12 12:00 |
04:03:56.61 |
+05:40:26.0 |
HIP 18953 |
4.21 |
| 2026-05-13 00:00 |
04:04:04.85 |
+05:41:15.5 |
HIP 18953 |
5.66 |
| 2026-05-13 12:00 |
04:04:13.10 |
+05:42:04.6 |
HIP 18953 |
7.50 |
| 2026-05-14 00:00 |
04:04:21.36 |
+05:42:53.5 |
HIP 18953 |
9.50 |
| 2026-05-14 12:00 |
04:04:29.62 |
+05:43:42.1 |
HIP 18953 |
11.57 |
| 2026-05-15 00:00 |
04:04:37.90 |
+05:44:30.4 |
HIP 18953 |
13.69 |
| 2026-05-15 12:00 |
04:04:46.18 |
+05:45:18.4 |
HIP 18953 |
15.84 |
| 2026-05-16 00:00 |
04:04:54.48 |
+05:46:06.1 |
HIP 18953 |
18.00 |
| 2026-05-16 12:00 |
04:05:02.78 |
+05:46:53.5 |
HIP 18953 |
20.18 |
| 2026-05-17 00:00 |
04:05:11.08 |
+05:47:40.6 |
HIP 18953 |
22.36 |
| 2026-05-17 12:00 |
04:05:19.39 |
+05:48:27.4 |
HIP 19189 |
22.43 |
| 2026-05-18 00:00 |
04:05:27.71 |
+05:49:13.9 |
HIP 19189 |
20.77 |
| 2026-05-18 12:00 |
04:05:36.03 |
+05:50:00.1 |
HIP 19189 |
19.22 |
| 2026-05-19 00:00 |
04:05:44.36 |
+05:50:46.0 |
HIP 19189 |
17.80 |
| 2026-05-19 12:00 |
04:05:52.69 |
+05:51:31.6 |
HIP 19189 |
16.55 |
| 2026-05-20 00:00 |
04:06:01.02 |
+05:52:16.9 |
HIP 19189 |
15.52 |
| 2026-05-20 12:00 |
04:06:09.35 |
+05:53:01.9 |
HIP 19189 |
14.74 |
| 2026-05-21 00:00 |
04:06:17.69 |
+05:53:46.6 |
HIP 19189 |
14.26 |
| 2026-05-21 12:00 |
04:06:26.03 |
+05:54:31.0 |
HIP 19189 |
14.10 |
| 2026-05-22 00:00 |
04:06:34.36 |
+05:55:15.1 |
HIP 19189 |
14.28 |
| 2026-05-22 12:00 |
04:06:42.70 |
+05:55:58.8 |
HIP 19189 |
14.78 |
| 2026-05-23 00:00 |
04:06:51.04 |
+05:56:42.3 |
HIP 19189 |
15.58 |
| 2026-05-23 12:00 |
04:06:59.38 |
+05:57:25.4 |
HIP 19189 |
16.62 |
| 2026-05-24 00:00 |
04:07:07.72 |
+05:58:08.2 |
HIP 19189 |
17.87 |
| 2026-05-24 12:00 |
04:07:16.05 |
+05:58:50.7 |
HIP 19189 |
19.28 |
| 2026-05-25 00:00 |
04:07:24.38 |
+05:59:32.9 |
HIP 19271 |
19.16 |
| 2026-05-25 12:00 |
04:07:32.71 |
+06:00:14.8 |
HIP 19271 |
19.22 |
| 2026-05-26 00:00 |
04:07:41.04 |
+06:00:56.4 |
HIP 19271 |
19.53 |
| 2026-05-26 12:00 |
04:07:49.36 |
+06:01:37.6 |
HIP 19271 |
20.06 |
| 2026-05-27 00:00 |
04:07:57.68 |
+06:02:18.6 |
HIP 19271 |
20.80 |
| 2026-05-27 12:00 |
04:08:06.00 |
+06:02:59.2 |
HIP 19271 |
21.73 |
| 2026-05-28 00:00 |
04:08:14.31 |
+06:03:39.5 |
HIP 19271 |
22.83 |
| 2026-05-28 12:00 |
04:08:22.61 |
+06:04:19.5 |
HIP 19271 |
24.06 |
| 2026-05-29 00:00 |
04:08:30.91 |
+06:04:59.2 |
HIP 19271 |
25.42 |
| 2026-05-29 12:00 |
04:08:39.20 |
+06:05:38.6 |
HIP 19271 |
26.88 |
| 2026-05-30 00:00 |
04:08:47.49 |
+06:06:17.6 |
HIP 19271 |
28.42 |
| 2026-05-30 12:00 |
04:08:55.76 |
+06:06:56.3 |
HIP 19271 |
30.03 |
| 2026-05-31 00:00 |
04:09:04.03 |
+06:07:34.7 |
HIP 19271 |
31.70 |
| 2026-05-31 12:00 |
04:09:12.30 |
+06:08:12.8 |
HIP 19271 |
33.43 |
| 2026-06-01 00:00 |
04:09:20.55 |
+06:08:50.6 |
HIP 19411 |
34.71 |
| 2026-06-01 12:00 |
04:09:28.79 |
+06:09:28.0 |
HIP 19411 |
34.05 |
| 2026-06-02 00:00 |
04:09:37.03 |
+06:10:05.1 |
HIP 19411 |
33.51 |