C/2022 J2 (Bok)
| Parameter |
Value |
| Designation |
C/2022 J2 (Bok) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-10-27T01:33:00.308160Z |
| Orbit solution date (soln_date, UTC) |
2023-06-01T23:12:41Z |
| Obs used |
135 |
| NEO |
- |
| M1 |
15.600 |
| K1 |
10.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-05-09T04:30:45.273600Z |
| Discovery magnitude (MPC) |
21.56 G |
| Discovery observatory (MPC) |
V00 · Kitt Peak-Bok |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-07-28.0000000 |
| e |
0.98023028 |
| q (au) |
1.827561 |
| a (au) |
92.442404 |
| i (deg) |
149.092718 |
| Ω (om, deg) |
252.557091 |
| ω (w, deg) |
133.064666 |
| M (ma, deg) |
359.899017 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.303 + 4.447\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.303 |
| n |
4.447 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.958 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
23:53:56.91 |
-32:07:16.5 |
HIP 117931 |
20.71 |
| 2026-02-03 12:00 |
23:54:03.35 |
-32:05:54.3 |
HIP 117931 |
18.81 |
| 2026-02-04 00:00 |
23:54:09.84 |
-32:04:32.4 |
HIP 117931 |
16.90 |
| 2026-02-04 12:00 |
23:54:16.39 |
-32:03:10.7 |
HIP 117931 |
15.00 |
| 2026-02-05 00:00 |
23:54:23.00 |
-32:01:49.3 |
HIP 117931 |
13.11 |
| 2026-02-05 12:00 |
23:54:29.66 |
-32:00:28.2 |
HIP 117931 |
11.22 |
| 2026-02-06 00:00 |
23:54:36.37 |
-31:59:07.4 |
HIP 117931 |
9.35 |
| 2026-02-06 12:00 |
23:54:43.14 |
-31:57:46.9 |
HIP 117931 |
7.52 |
| 2026-02-07 00:00 |
23:54:49.97 |
-31:56:26.6 |
HIP 117931 |
5.76 |
| 2026-02-07 12:00 |
23:54:56.85 |
-31:55:06.7 |
HIP 117931 |
4.19 |
| 2026-02-08 00:00 |
23:55:03.78 |
-31:53:47.1 |
HIP 117932 |
2.83 |
| 2026-02-08 12:00 |
23:55:10.76 |
-31:52:27.8 |
HIP 117932 |
1.39 |
| 2026-02-09 00:00 |
23:55:17.79 |
-31:51:08.9 |
HIP 117932 |
1.92 |
| 2026-02-09 12:00 |
23:55:24.87 |
-31:49:50.2 |
HIP 117932 |
3.66 |
| 2026-02-10 00:00 |
23:55:32.00 |
-31:48:31.9 |
HIP 117932 |
5.57 |
| 2026-02-10 12:00 |
23:55:39.19 |
-31:47:13.9 |
HIP 117932 |
7.54 |
| 2026-02-11 00:00 |
23:55:46.42 |
-31:45:56.3 |
HIP 117932 |
9.52 |
| 2026-02-11 12:00 |
23:55:53.69 |
-31:44:39.0 |
HIP 117932 |
11.51 |
| 2026-02-12 00:00 |
23:56:01.02 |
-31:43:22.0 |
HIP 117932 |
13.51 |
| 2026-02-12 12:00 |
23:56:08.39 |
-31:42:05.4 |
HIP 117932 |
15.52 |
| 2026-02-13 00:00 |
23:56:15.81 |
-31:40:49.2 |
HIP 117932 |
17.54 |
| 2026-02-13 12:00 |
23:56:23.27 |
-31:39:33.3 |
HIP 117932 |
19.56 |
| 2026-02-14 00:00 |
23:56:30.78 |
-31:38:17.8 |
HIP 117932 |
21.59 |
| 2026-02-14 12:00 |
23:56:38.33 |
-31:37:02.7 |
HIP 117932 |
23.61 |
| 2026-02-15 00:00 |
23:56:45.92 |
-31:35:47.9 |
HIP 117932 |
25.65 |
| 2026-02-15 12:00 |
23:56:53.55 |
-31:34:33.6 |
HIP 118220 |
25.21 |
| 2026-02-16 00:00 |
23:57:01.23 |
-31:33:19.6 |
HIP 118220 |
23.36 |
| 2026-02-16 12:00 |
23:57:08.95 |
-31:32:06.0 |
HIP 118220 |
21.52 |
| 2026-02-17 00:00 |
23:57:16.71 |
-31:30:52.8 |
HIP 118220 |
19.73 |
| 2026-02-17 12:00 |
23:57:24.51 |
-31:29:40.0 |
HIP 118220 |
17.98 |
| 2026-02-18 00:00 |
23:57:32.34 |
-31:28:27.6 |
HIP 118220 |
16.29 |
| 2026-02-18 12:00 |
23:57:40.22 |
-31:27:15.7 |
HIP 118220 |
14.69 |
| 2026-02-19 00:00 |
23:57:48.13 |
-31:26:04.1 |
HIP 118220 |
13.21 |
| 2026-02-19 12:00 |
23:57:56.08 |
-31:24:53.0 |
HIP 118220 |
11.89 |
| 2026-02-20 00:00 |
23:58:04.06 |
-31:23:42.3 |
HIP 118220 |
10.80 |
| 2026-02-20 12:00 |
23:58:12.08 |
-31:22:32.0 |
HIP 118220 |
10.01 |
| 2026-02-21 00:00 |
23:58:20.14 |
-31:21:22.2 |
HIP 118220 |
9.60 |
| 2026-02-21 12:00 |
23:58:28.23 |
-31:20:12.8 |
HIP 118220 |
9.62 |
| 2026-02-22 00:00 |
23:58:36.35 |
-31:19:03.9 |
HIP 118220 |
10.07 |
| 2026-02-22 12:00 |
23:58:44.50 |
-31:17:55.4 |
HIP 118220 |
10.90 |
| 2026-02-23 00:00 |
23:58:52.69 |
-31:16:47.3 |
HIP 118220 |
12.03 |
| 2026-02-23 12:00 |
23:59:00.90 |
-31:15:39.7 |
HIP 118220 |
13.38 |
| 2026-02-24 00:00 |
23:59:09.15 |
-31:14:32.6 |
HIP 118220 |
14.89 |