C/1968 Q2 (Honda)
| Parameter |
Value |
| Designation |
C/1968 Q2 (Honda) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1968-11-03T20:03:50.408640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:19Z |
| Obs used |
35 |
| NEO |
- |
| M1 |
6.600 |
| K1 |
33.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1968-10-22.0000000 |
| e |
1.00000000 |
| q (au) |
1.099008 |
| a (au) |
- |
| i (deg) |
127.912524 |
| Ω (om, deg) |
253.292861 |
| ω (w, deg) |
282.803926 |
| M (ma, deg) |
- |
Magnitude
Scatter + Global Linear
$$
M_a = (7.086 + 3.394\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.086 |
| n |
3.394 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
13:03:00.58 |
+52:25:56.9 |
HIP 63637 |
11.82 |
| 2026-02-03 12:00 |
13:02:59.54 |
+52:26:16.1 |
HIP 63773 |
12.00 |
| 2026-02-04 00:00 |
13:02:58.50 |
+52:26:35.2 |
HIP 63773 |
12.14 |
| 2026-02-04 12:00 |
13:02:57.43 |
+52:26:54.2 |
HIP 63773 |
12.29 |
| 2026-02-05 00:00 |
13:02:56.35 |
+52:27:13.2 |
HIP 63773 |
12.45 |
| 2026-02-05 12:00 |
13:02:55.25 |
+52:27:32.2 |
HIP 63773 |
12.62 |
| 2026-02-06 00:00 |
13:02:54.13 |
+52:27:51.1 |
HIP 63773 |
12.81 |
| 2026-02-06 12:00 |
13:02:52.99 |
+52:28:10.0 |
HIP 63773 |
13.00 |
| 2026-02-07 00:00 |
13:02:51.84 |
+52:28:28.8 |
HIP 63773 |
13.20 |
| 2026-02-07 12:00 |
13:02:50.67 |
+52:28:47.6 |
HIP 63773 |
13.41 |
| 2026-02-08 00:00 |
13:02:49.48 |
+52:29:06.3 |
HIP 63773 |
13.63 |
| 2026-02-08 12:00 |
13:02:48.28 |
+52:29:24.9 |
HIP 63773 |
13.86 |
| 2026-02-09 00:00 |
13:02:47.06 |
+52:29:43.5 |
HIP 63773 |
14.09 |
| 2026-02-09 12:00 |
13:02:45.82 |
+52:30:02.1 |
HIP 63773 |
14.34 |
| 2026-02-10 00:00 |
13:02:44.57 |
+52:30:20.6 |
HIP 63773 |
14.59 |
| 2026-02-10 12:00 |
13:02:43.30 |
+52:30:39.0 |
HIP 63773 |
14.84 |
| 2026-02-11 00:00 |
13:02:42.01 |
+52:30:57.4 |
HIP 63773 |
15.11 |
| 2026-02-11 12:00 |
13:02:40.71 |
+52:31:15.7 |
HIP 63773 |
15.38 |
| 2026-02-12 00:00 |
13:02:39.39 |
+52:31:33.9 |
HIP 63522 |
15.17 |
| 2026-02-12 12:00 |
13:02:38.06 |
+52:31:52.1 |
HIP 63522 |
14.96 |
| 2026-02-13 00:00 |
13:02:36.70 |
+52:32:10.2 |
HIP 63522 |
14.75 |
| 2026-02-13 12:00 |
13:02:35.34 |
+52:32:28.2 |
HIP 63522 |
14.54 |
| 2026-02-14 00:00 |
13:02:33.95 |
+52:32:46.2 |
HIP 63522 |
14.34 |
| 2026-02-14 12:00 |
13:02:32.55 |
+52:33:04.1 |
HIP 63522 |
14.14 |
| 2026-02-15 00:00 |
13:02:31.14 |
+52:33:21.9 |
HIP 63522 |
13.95 |
| 2026-02-15 12:00 |
13:02:29.71 |
+52:33:39.6 |
HIP 63522 |
13.76 |
| 2026-02-16 00:00 |
13:02:28.26 |
+52:33:57.3 |
HIP 63522 |
13.57 |
| 2026-02-16 12:00 |
13:02:26.80 |
+52:34:14.9 |
HIP 63522 |
13.40 |
| 2026-02-17 00:00 |
13:02:25.33 |
+52:34:32.4 |
HIP 63522 |
13.22 |
| 2026-02-17 12:00 |
13:02:23.84 |
+52:34:49.8 |
HIP 63522 |
13.05 |
| 2026-02-18 00:00 |
13:02:22.33 |
+52:35:07.1 |
HIP 63522 |
12.89 |
| 2026-02-18 12:00 |
13:02:20.81 |
+52:35:24.4 |
HIP 63522 |
12.73 |
| 2026-02-19 00:00 |
13:02:19.27 |
+52:35:41.6 |
HIP 63522 |
12.58 |
| 2026-02-19 12:00 |
13:02:17.72 |
+52:35:58.6 |
HIP 63522 |
12.44 |
| 2026-02-20 00:00 |
13:02:16.16 |
+52:36:15.6 |
HIP 63522 |
12.30 |
| 2026-02-20 12:00 |
13:02:14.58 |
+52:36:32.5 |
HIP 63522 |
12.17 |
| 2026-02-21 00:00 |
13:02:12.98 |
+52:36:49.4 |
HIP 63522 |
12.05 |
| 2026-02-21 12:00 |
13:02:11.38 |
+52:37:06.1 |
HIP 63522 |
11.94 |
| 2026-02-22 00:00 |
13:02:09.76 |
+52:37:22.7 |
HIP 63522 |
11.83 |
| 2026-02-22 12:00 |
13:02:08.12 |
+52:37:39.2 |
HIP 63522 |
11.73 |
| 2026-02-23 00:00 |
13:02:06.47 |
+52:37:55.7 |
HIP 63522 |
11.64 |
| 2026-02-23 12:00 |
13:02:04.81 |
+52:38:12.0 |
HIP 63522 |
11.56 |
| 2026-02-24 00:00 |
13:02:03.13 |
+52:38:28.3 |
HIP 63522 |
11.49 |