| Parameter |
Value |
| Designation |
C/2022 U3 (Bok) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2024-07-28T01:29:51.809280Z |
| Orbit solution date (soln_date, UTC) |
2026-03-07T14:42:53Z |
| Obs used |
803 |
| NEO |
- |
| M1 |
8.800 |
| K1 |
8.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2022-10-31T06:16:30.662400Z |
| Discovery magnitude (MPC) |
19.66 G |
| Discovery observatory (MPC) |
V00 · Kitt Peak-Bok |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2023-12-18.0000000 |
| e |
1.00318343 |
| q (au) |
4.826915 |
| a (au) |
-1516.261844 |
| i (deg) |
33.638233 |
| Ω (om, deg) |
272.788587 |
| ω (w, deg) |
189.047254 |
| M (ma, deg) |
-0.003724 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.781 + 3.427\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.781 |
| n |
3.427 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2021-06-23 |
2024-04-10 |
+2.0797 |
-1.688 |
| 2024-09-14 |
2026-02-07 |
+7.5196 |
-4.311 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
10:51:29.93 |
-25:02:50.5 |
HIP 53010 |
30.53 |
| 2026-09-20 12:00 |
10:51:48.93 |
-25:05:13.8 |
HIP 53010 |
30.23 |
| 2026-09-21 00:00 |
10:52:07.90 |
-25:07:37.6 |
HIP 53095 |
29.96 |
| 2026-09-21 12:00 |
10:52:26.84 |
-25:10:02.0 |
HIP 53095 |
28.75 |
| 2026-09-22 00:00 |
10:52:45.74 |
-25:12:26.9 |
HIP 53095 |
28.34 |
| 2026-09-22 12:00 |
10:53:04.61 |
-25:14:52.3 |
HIP 53095 |
28.76 |
| 2026-09-23 00:00 |
10:53:23.45 |
-25:17:18.2 |
HIP 53095 |
29.97 |
| 2026-09-23 12:00 |
10:53:42.26 |
-25:19:44.6 |
HIP 53095 |
31.88 |
| 2026-09-24 00:00 |
10:54:01.03 |
-25:22:11.5 |
HIP 53468 |
33.06 |
| 2026-09-24 12:00 |
10:54:19.77 |
-25:24:39.0 |
HIP 53468 |
28.21 |
| 2026-09-25 00:00 |
10:54:38.47 |
-25:27:06.9 |
HIP 53468 |
23.38 |
| 2026-09-25 12:00 |
10:54:57.13 |
-25:29:35.4 |
HIP 53468 |
18.60 |
| 2026-09-26 00:00 |
10:55:15.76 |
-25:32:04.3 |
HIP 53468 |
13.89 |
| 2026-09-26 12:00 |
10:55:34.36 |
-25:34:33.7 |
HIP 53468 |
9.38 |
| 2026-09-27 00:00 |
10:55:52.91 |
-25:37:03.6 |
HIP 53468 |
5.54 |
| 2026-09-27 12:00 |
10:56:11.43 |
-25:39:34.0 |
HIP 53468 |
4.58 |
| 2026-09-28 00:00 |
10:56:29.91 |
-25:42:04.9 |
HIP 53468 |
7.67 |
| 2026-09-28 12:00 |
10:56:48.35 |
-25:44:36.3 |
HIP 53468 |
12.00 |
| 2026-09-29 00:00 |
10:57:06.75 |
-25:47:08.1 |
HIP 53468 |
16.62 |
| 2026-09-29 12:00 |
10:57:25.12 |
-25:49:40.4 |
HIP 53468 |
21.34 |
| 2026-09-30 00:00 |
10:57:43.44 |
-25:52:13.1 |
HIP 53658 |
19.33 |
| 2026-09-30 12:00 |
10:58:01.72 |
-25:54:46.4 |
HIP 53658 |
14.76 |
| 2026-10-01 00:00 |
10:58:19.96 |
-25:57:20.1 |
HIP 53658 |
10.43 |
| 2026-10-01 12:00 |
10:58:38.16 |
-25:59:54.2 |
HIP 53658 |
6.81 |
| 2026-10-02 00:00 |
10:58:56.31 |
-26:02:28.8 |
HIP 53658 |
5.53 |
| 2026-10-02 12:00 |
10:59:14.43 |
-26:05:03.8 |
HIP 53658 |
7.81 |
| 2026-10-03 00:00 |
10:59:32.50 |
-26:07:39.3 |
HIP 53658 |
11.73 |
| 2026-10-03 12:00 |
10:59:50.52 |
-26:10:15.3 |
HIP 53658 |
16.13 |
| 2026-10-04 00:00 |
11:00:08.50 |
-26:12:51.6 |
HIP 53658 |
20.70 |
| 2026-10-04 12:00 |
11:00:26.44 |
-26:15:28.4 |
HIP 53810 |
24.16 |
| 2026-10-05 00:00 |
11:00:44.33 |
-26:18:05.7 |
HIP 53810 |
26.81 |
| 2026-10-05 12:00 |
11:01:02.17 |
-26:20:43.3 |
HIP 53810 |
30.01 |
| 2026-10-06 00:00 |
11:01:19.97 |
-26:23:21.4 |
HIP 53963 |
30.17 |
| 2026-10-06 12:00 |
11:01:37.71 |
-26:26:00.0 |
HIP 53963 |
26.05 |
| 2026-10-07 00:00 |
11:01:55.41 |
-26:28:38.8 |
HIP 53963 |
22.19 |
| 2026-10-07 12:00 |
11:02:13.06 |
-26:31:18.2 |
HIP 53963 |
18.74 |
| 2026-10-08 00:00 |
11:02:30.66 |
-26:33:57.9 |
HIP 53963 |
15.97 |
| 2026-10-08 12:00 |
11:02:48.21 |
-26:36:38.0 |
HIP 53963 |
14.27 |
| 2026-10-09 00:00 |
11:03:05.71 |
-26:39:18.5 |
HIP 53963 |
14.02 |
| 2026-10-09 12:00 |
11:03:23.16 |
-26:41:59.4 |
HIP 53963 |
15.30 |
| 2026-10-10 00:00 |
11:03:40.55 |
-26:44:40.7 |
HIP 54167 |
16.35 |
| 2026-10-10 12:00 |
11:03:57.90 |
-26:47:22.4 |
HIP 54167 |
11.85 |
| 2026-10-11 00:00 |
11:04:15.18 |
-26:50:04.4 |
HIP 54167 |
7.63 |