| Parameter |
Value |
| Designation |
C/2026 AZ17 (Bok) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2026-11-23T05:18:40.613760Z |
| Orbit solution date (soln_date, UTC) |
2026-10-01T14:42:11Z |
| Obs used |
770 |
| NEO |
- |
| M1 |
9.400 |
| K1 |
15.250 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2026-06-24.0000000 |
| e |
0.96190933 |
| q (au) |
2.472638 |
| a (au) |
64.914536 |
| i (deg) |
36.233596 |
| Ω (om, deg) |
149.974243 |
| ω (w, deg) |
146.912661 |
| M (ma, deg) |
359.713142 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.161 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.161 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-25 00:00 |
17:13:04.04 |
+05:08:56.2 |
HIP 84294 |
19.28 |
| 2026-09-25 12:00 |
17:13:47.12 |
+05:00:41.3 |
HIP 84294 |
6.15 |
| 2026-09-26 00:00 |
17:14:30.42 |
+04:52:27.6 |
HIP 84294 |
8.41 |
| 2026-09-26 12:00 |
17:15:13.94 |
+04:44:15.3 |
HIP 84294 |
21.76 |
| 2026-09-27 00:00 |
17:15:57.68 |
+04:36:04.4 |
HIP 84432 |
30.99 |
| 2026-09-27 12:00 |
17:16:41.65 |
+04:27:54.8 |
HIP 84594 |
26.68 |
| 2026-09-28 00:00 |
17:17:25.84 |
+04:19:46.6 |
HIP 84594 |
15.21 |
| 2026-09-28 12:00 |
17:18:10.25 |
+04:11:39.7 |
HIP 84594 |
11.28 |
| 2026-09-29 00:00 |
17:18:54.87 |
+04:03:34.3 |
HIP 84594 |
20.05 |
| 2026-09-29 12:00 |
17:19:39.71 |
+03:55:30.3 |
HIP 84828 |
22.00 |
| 2026-09-30 00:00 |
17:20:24.77 |
+03:47:27.8 |
HIP 84828 |
28.36 |
| 2026-09-30 12:00 |
17:21:10.04 |
+03:39:26.7 |
HIP 84961 |
24.40 |
| 2026-10-01 00:00 |
17:21:55.52 |
+03:31:27.1 |
HIP 84961 |
13.81 |
| 2026-10-01 12:00 |
17:22:41.22 |
+03:23:29.0 |
HIP 84961 |
13.16 |
| 2026-10-02 00:00 |
17:23:27.13 |
+03:15:32.4 |
HIP 85153 |
14.62 |
| 2026-10-02 12:00 |
17:24:13.25 |
+03:07:37.4 |
HIP 85153 |
4.34 |
| 2026-10-03 00:00 |
17:24:59.58 |
+02:59:43.9 |
HIP 85153 |
14.69 |
| 2026-10-03 12:00 |
17:25:46.11 |
+02:51:52.0 |
HIP 85279 |
27.11 |
| 2026-10-04 00:00 |
17:26:32.86 |
+02:44:01.6 |
HIP 85390 |
23.98 |
| 2026-10-04 12:00 |
17:27:19.80 |
+02:36:12.9 |
HIP 85390 |
16.70 |
| 2026-10-05 00:00 |
17:28:06.96 |
+02:28:25.8 |
HIP 85496 |
16.50 |
| 2026-10-05 12:00 |
17:28:54.32 |
+02:20:40.3 |
HIP 85496 |
12.10 |
| 2026-10-06 00:00 |
17:29:41.88 |
+02:12:56.6 |
HIP 85496 |
20.57 |
| 2026-10-06 12:00 |
17:30:29.64 |
+02:05:14.4 |
HIP 85750 |
14.97 |
| 2026-10-07 00:00 |
17:31:17.60 |
+01:57:34.0 |
HIP 85750 |
1.72 |
| 2026-10-07 12:00 |
17:32:05.76 |
+01:49:55.3 |
HIP 85766 |
12.96 |
| 2026-10-08 00:00 |
17:32:54.12 |
+01:42:18.4 |
HIP 85766 |
20.91 |
| 2026-10-08 12:00 |
17:33:42.68 |
+01:34:43.2 |
HIP 85766 |
33.42 |
| 2026-10-09 00:00 |
17:34:31.43 |
+01:27:09.8 |
HIP 86090 |
25.73 |
| 2026-10-09 12:00 |
17:35:20.38 |
+01:19:38.1 |
HIP 86090 |
13.09 |
| 2026-10-10 00:00 |
17:36:09.51 |
+01:12:08.3 |
HIP 86152 |
3.82 |
| 2026-10-10 12:00 |
17:36:58.84 |
+01:04:40.3 |
HIP 86152 |
13.93 |
| 2026-10-11 00:00 |
17:37:48.36 |
+00:57:14.1 |
HIP 86152 |
28.11 |
| 2026-10-11 12:00 |
17:38:38.07 |
+00:49:49.8 |
HIP 86409 |
16.60 |
| 2026-10-12 00:00 |
17:39:27.97 |
+00:42:27.3 |
HIP 86409 |
5.09 |
| 2026-10-12 12:00 |
17:40:18.05 |
+00:35:06.8 |
HIP 86460 |
11.63 |
| 2026-10-13 00:00 |
17:41:08.31 |
+00:27:48.1 |
HIP 86526 |
19.86 |
| 2026-10-13 12:00 |
17:41:58.76 |
+00:20:31.4 |
HIP 86526 |
19.72 |
| 2026-10-14 00:00 |
17:42:49.39 |
+00:13:16.6 |
HIP 86797 |
21.69 |
| 2026-10-14 12:00 |
17:43:40.19 |
+00:06:03.7 |
HIP 86797 |
16.96 |
| 2026-10-15 00:00 |
17:44:31.18 |
-00:01:07.2 |
HIP 86862 |
8.50 |
| 2026-10-15 12:00 |
17:45:22.34 |
-00:08:16.1 |
HIP 86862 |
7.91 |
| 2026-10-16 00:00 |
17:46:13.68 |
-00:15:23.1 |
HIP 86862 |
21.99 |