| 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) |
| 2026-05-12 00:00 |
00:19:56.40 |
-30:25:43.3 |
HIP 1631 |
10.25 |
| 2026-05-12 12:00 |
00:20:02.00 |
-30:26:21.3 |
HIP 1631 |
8.99 |
| 2026-05-13 00:00 |
00:20:07.54 |
-30:27:00.1 |
HIP 1631 |
7.75 |
| 2026-05-13 12:00 |
00:20:13.02 |
-30:27:39.7 |
HIP 1631 |
6.55 |
| 2026-05-14 00:00 |
00:20:18.44 |
-30:28:20.0 |
HIP 1631 |
5.43 |
| 2026-05-14 12:00 |
00:20:23.80 |
-30:29:01.2 |
HIP 1631 |
4.42 |
| 2026-05-15 00:00 |
00:20:29.09 |
-30:29:43.2 |
HIP 1631 |
3.61 |
| 2026-05-15 12:00 |
00:20:34.32 |
-30:30:25.9 |
HIP 1631 |
3.17 |
| 2026-05-16 00:00 |
00:20:39.49 |
-30:31:09.4 |
HIP 1631 |
3.24 |
| 2026-05-16 12:00 |
00:20:44.59 |
-30:31:53.8 |
HIP 1631 |
3.79 |
| 2026-05-17 00:00 |
00:20:49.62 |
-30:32:38.9 |
HIP 1631 |
4.64 |
| 2026-05-17 12:00 |
00:20:54.59 |
-30:33:24.8 |
HIP 1631 |
5.66 |
| 2026-05-18 00:00 |
00:20:59.50 |
-30:34:11.5 |
HIP 1631 |
6.77 |
| 2026-05-18 12:00 |
00:21:04.33 |
-30:34:59.0 |
HIP 1631 |
7.93 |
| 2026-05-19 00:00 |
00:21:09.10 |
-30:35:47.3 |
HIP 1631 |
9.12 |
| 2026-05-19 12:00 |
00:21:13.81 |
-30:36:36.4 |
HIP 1631 |
10.33 |
| 2026-05-20 00:00 |
00:21:18.44 |
-30:37:26.2 |
HIP 1631 |
11.55 |
| 2026-05-20 12:00 |
00:21:23.01 |
-30:38:16.9 |
HIP 1631 |
12.77 |
| 2026-05-21 00:00 |
00:21:27.50 |
-30:39:08.3 |
HIP 1631 |
14.00 |
| 2026-05-21 12:00 |
00:21:31.93 |
-30:40:00.5 |
HIP 1631 |
15.23 |
| 2026-05-22 00:00 |
00:21:36.28 |
-30:40:53.5 |
HIP 1631 |
16.47 |
| 2026-05-22 12:00 |
00:21:40.57 |
-30:41:47.2 |
HIP 1631 |
17.70 |
| 2026-05-23 00:00 |
00:21:44.78 |
-30:42:41.7 |
HIP 1631 |
18.93 |
| 2026-05-23 12:00 |
00:21:48.93 |
-30:43:37.0 |
HIP 1631 |
20.16 |
| 2026-05-24 00:00 |
00:21:53.00 |
-30:44:33.1 |
HIP 1631 |
21.40 |
| 2026-05-24 12:00 |
00:21:57.00 |
-30:45:29.9 |
HIP 1631 |
22.63 |
| 2026-05-25 00:00 |
00:22:00.92 |
-30:46:27.5 |
HIP 1830 |
21.97 |
| 2026-05-25 12:00 |
00:22:04.78 |
-30:47:25.8 |
HIP 1830 |
20.69 |
| 2026-05-26 00:00 |
00:22:08.56 |
-30:48:24.9 |
HIP 1830 |
19.42 |
| 2026-05-26 12:00 |
00:22:12.26 |
-30:49:24.8 |
HIP 1830 |
18.15 |
| 2026-05-27 00:00 |
00:22:15.90 |
-30:50:25.4 |
HIP 1830 |
16.89 |
| 2026-05-27 12:00 |
00:22:19.45 |
-30:51:26.8 |
HIP 1830 |
15.63 |
| 2026-05-28 00:00 |
00:22:22.93 |
-30:52:29.0 |
HIP 1830 |
14.38 |
| 2026-05-28 12:00 |
00:22:26.34 |
-30:53:31.8 |
HIP 1830 |
13.14 |
| 2026-05-29 00:00 |
00:22:29.67 |
-30:54:35.5 |
HIP 1830 |
11.91 |
| 2026-05-29 12:00 |
00:22:32.93 |
-30:55:39.8 |
HIP 1830 |
10.69 |
| 2026-05-30 00:00 |
00:22:36.10 |
-30:56:45.0 |
HIP 1830 |
9.50 |
| 2026-05-30 12:00 |
00:22:39.20 |
-30:57:50.8 |
HIP 1830 |
8.35 |
| 2026-05-31 00:00 |
00:22:42.23 |
-30:58:57.4 |
HIP 1830 |
7.25 |
| 2026-05-31 12:00 |
00:22:45.17 |
-31:00:04.8 |
HIP 1830 |
6.23 |
| 2026-06-01 00:00 |
00:22:48.04 |
-31:01:12.8 |
HIP 1830 |
5.34 |
| 2026-06-01 12:00 |
00:22:50.82 |
-31:02:21.6 |
HIP 1830 |
4.67 |
| 2026-06-02 00:00 |
00:22:53.53 |
-31:03:31.2 |
HIP 1830 |
4.31 |