| Parameter |
Value |
| Designation |
C/2026 AZ17 (Bok) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2026-11-23T05:26:39.624000Z |
| Orbit solution date (soln_date, UTC) |
2026-07-28T14:12:17Z |
| Obs used |
530 |
| NEO |
- |
| M1 |
9.200 |
| K1 |
15.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2026-05-31.0000000 |
| e |
0.96186838 |
| q (au) |
2.472629 |
| a (au) |
64.844578 |
| i (deg) |
36.233603 |
| Ω (om, deg) |
149.974461 |
| ω (w, deg) |
146.913744 |
| M (ma, deg) |
359.667367 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.239 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.239 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.825 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
16:21:04.85 |
+21:39:26.3 |
HIP 80156 |
8.53 |
| 2026-07-29 12:00 |
16:21:13.46 |
+21:31:46.3 |
HIP 80156 |
9.92 |
| 2026-07-30 00:00 |
16:21:22.41 |
+21:24:04.1 |
HIP 80156 |
15.81 |
| 2026-07-30 12:00 |
16:21:31.70 |
+21:16:19.6 |
HIP 80021 |
22.02 |
| 2026-07-31 00:00 |
16:21:41.34 |
+21:08:32.9 |
HIP 80021 |
22.64 |
| 2026-07-31 12:00 |
16:21:51.31 |
+21:00:44.1 |
HIP 80302 |
24.51 |
| 2026-08-01 00:00 |
16:22:01.63 |
+20:52:53.2 |
HIP 80302 |
24.37 |
| 2026-08-01 12:00 |
16:22:12.29 |
+20:45:00.2 |
HIP 80086 |
23.25 |
| 2026-08-02 00:00 |
16:22:23.29 |
+20:37:05.1 |
HIP 80086 |
23.08 |
| 2026-08-02 12:00 |
16:22:34.63 |
+20:29:08.0 |
HIP 80333 |
22.93 |
| 2026-08-03 00:00 |
16:22:46.31 |
+20:21:09.0 |
HIP 80333 |
17.62 |
| 2026-08-03 12:00 |
16:22:58.33 |
+20:13:08.0 |
HIP 80333 |
15.34 |
| 2026-08-04 00:00 |
16:23:10.69 |
+20:05:05.1 |
HIP 80333 |
17.41 |
| 2026-08-04 12:00 |
16:23:23.39 |
+19:57:00.4 |
HIP 80334 |
20.86 |
| 2026-08-05 00:00 |
16:23:36.43 |
+19:48:53.9 |
HIP 80334 |
12.23 |
| 2026-08-05 12:00 |
16:23:49.82 |
+19:40:45.5 |
HIP 80334 |
3.69 |
| 2026-08-06 00:00 |
16:24:03.54 |
+19:32:35.4 |
HIP 80334 |
5.53 |
| 2026-08-06 12:00 |
16:24:17.60 |
+19:24:23.6 |
HIP 80329 |
13.49 |
| 2026-08-07 00:00 |
16:24:32.00 |
+19:16:10.2 |
HIP 80329 |
9.14 |
| 2026-08-07 12:00 |
16:24:46.74 |
+19:07:55.1 |
HIP 80444 |
9.44 |
| 2026-08-08 00:00 |
16:25:01.81 |
+18:59:38.3 |
HIP 80488 |
12.40 |
| 2026-08-08 12:00 |
16:25:17.23 |
+18:51:20.1 |
HIP 80488 |
7.49 |
| 2026-08-09 00:00 |
16:25:32.99 |
+18:43:00.3 |
HIP 80488 |
11.09 |
| 2026-08-09 12:00 |
16:25:49.08 |
+18:34:39.0 |
HIP 80536 |
14.00 |
| 2026-08-10 00:00 |
16:26:05.51 |
+18:26:16.2 |
HIP 80536 |
6.11 |
| 2026-08-10 12:00 |
16:26:22.28 |
+18:17:52.1 |
HIP 80499 |
6.92 |
| 2026-08-11 00:00 |
16:26:39.38 |
+18:09:26.6 |
HIP 80499 |
12.22 |
| 2026-08-11 12:00 |
16:26:56.82 |
+18:00:59.7 |
HIP 80499 |
20.71 |
| 2026-08-12 00:00 |
16:27:14.60 |
+17:52:31.6 |
HIP 80662 |
26.36 |
| 2026-08-12 12:00 |
16:27:32.71 |
+17:44:02.2 |
HIP 80662 |
16.85 |
| 2026-08-13 00:00 |
16:27:51.16 |
+17:35:31.6 |
HIP 80662 |
7.30 |
| 2026-08-13 12:00 |
16:28:09.94 |
+17:26:59.8 |
HIP 80662 |
2.50 |
| 2026-08-14 00:00 |
16:28:29.05 |
+17:18:26.9 |
HIP 80662 |
12.09 |
| 2026-08-14 12:00 |
16:28:48.50 |
+17:09:52.9 |
HIP 80662 |
21.82 |
| 2026-08-15 00:00 |
16:29:08.27 |
+17:01:17.9 |
HIP 80701 |
17.63 |
| 2026-08-15 12:00 |
16:29:28.38 |
+16:52:41.8 |
HIP 80701 |
14.41 |
| 2026-08-16 00:00 |
16:29:48.82 |
+16:44:04.8 |
HIP 80701 |
17.37 |
| 2026-08-16 12:00 |
16:30:09.58 |
+16:35:26.8 |
HIP 80912 |
20.40 |
| 2026-08-17 00:00 |
16:30:30.68 |
+16:26:48.0 |
HIP 80912 |
12.68 |
| 2026-08-17 12:00 |
16:30:52.09 |
+16:18:08.3 |
HIP 80912 |
10.26 |
| 2026-08-18 00:00 |
16:31:13.84 |
+16:09:27.7 |
HIP 80912 |
15.89 |
| 2026-08-18 12:00 |
16:31:35.90 |
+16:00:46.4 |
HIP 80912 |
24.61 |
| 2026-08-19 00:00 |
16:31:58.29 |
+15:52:04.3 |
HIP 80912 |
34.18 |