C/1968 Q1 (Bally-Clayton)
| Parameter |
Value |
| Designation |
C/1968 Q1 (Bally-Clayton) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1968-08-20T20:17:35.787840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:19Z |
| Obs used |
52 |
| NEO |
- |
| M1 |
8.500 |
| K1 |
6.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1968-09-19.0000000 |
| e |
1.00000000 |
| q (au) |
1.771094 |
| a (au) |
- |
| i (deg) |
93.169377 |
| Ω (om, deg) |
319.395346 |
| ω (w, deg) |
26.864965 |
| M (ma, deg) |
- |
Magnitude
Scatter + Global Linear
$$
M_a = (7.709 + 5.798\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.709 |
| n |
5.798 |
| gf |
1.000 |
| gb |
-0.782 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
09:12:38.62 |
+05:30:44.0 |
HIP 45150 |
11.00 |
| 2026-02-03 12:00 |
09:12:37.18 |
+05:30:49.8 |
HIP 45150 |
10.68 |
| 2026-02-04 00:00 |
09:12:35.75 |
+05:30:55.7 |
HIP 45150 |
10.36 |
| 2026-02-04 12:00 |
09:12:34.31 |
+05:31:01.6 |
HIP 45150 |
10.04 |
| 2026-02-05 00:00 |
09:12:32.88 |
+05:31:07.6 |
HIP 45150 |
9.73 |
| 2026-02-05 12:00 |
09:12:31.44 |
+05:31:13.6 |
HIP 45150 |
9.42 |
| 2026-02-06 00:00 |
09:12:30.01 |
+05:31:19.7 |
HIP 45150 |
9.12 |
| 2026-02-06 12:00 |
09:12:28.57 |
+05:31:25.7 |
HIP 45150 |
8.83 |
| 2026-02-07 00:00 |
09:12:27.14 |
+05:31:31.8 |
HIP 45150 |
8.54 |
| 2026-02-07 12:00 |
09:12:25.71 |
+05:31:38.0 |
HIP 45150 |
8.25 |
| 2026-02-08 00:00 |
09:12:24.27 |
+05:31:44.1 |
HIP 45150 |
7.98 |
| 2026-02-08 12:00 |
09:12:22.84 |
+05:31:50.3 |
HIP 45150 |
7.71 |
| 2026-02-09 00:00 |
09:12:21.41 |
+05:31:56.6 |
HIP 45150 |
7.45 |
| 2026-02-09 12:00 |
09:12:19.98 |
+05:32:02.8 |
HIP 45150 |
7.21 |
| 2026-02-10 00:00 |
09:12:18.55 |
+05:32:09.1 |
HIP 45150 |
6.97 |
| 2026-02-10 12:00 |
09:12:17.12 |
+05:32:15.5 |
HIP 45150 |
6.75 |
| 2026-02-11 00:00 |
09:12:15.69 |
+05:32:21.8 |
HIP 45150 |
6.54 |
| 2026-02-11 12:00 |
09:12:14.27 |
+05:32:28.2 |
HIP 45150 |
6.35 |
| 2026-02-12 00:00 |
09:12:12.84 |
+05:32:34.6 |
HIP 45150 |
6.17 |
| 2026-02-12 12:00 |
09:12:11.42 |
+05:32:41.1 |
HIP 45150 |
6.01 |
| 2026-02-13 00:00 |
09:12:10.00 |
+05:32:47.5 |
HIP 45150 |
5.87 |
| 2026-02-13 12:00 |
09:12:08.58 |
+05:32:54.0 |
HIP 45150 |
5.76 |
| 2026-02-14 00:00 |
09:12:07.16 |
+05:33:00.6 |
HIP 45150 |
5.66 |
| 2026-02-14 12:00 |
09:12:05.74 |
+05:33:07.1 |
HIP 45150 |
5.59 |
| 2026-02-15 00:00 |
09:12:04.33 |
+05:33:13.7 |
HIP 45150 |
5.54 |
| 2026-02-15 12:00 |
09:12:02.92 |
+05:33:20.3 |
HIP 45150 |
5.52 |
| 2026-02-16 00:00 |
09:12:01.51 |
+05:33:26.9 |
HIP 45150 |
5.52 |
| 2026-02-16 12:00 |
09:12:00.11 |
+05:33:33.6 |
HIP 45150 |
5.55 |
| 2026-02-17 00:00 |
09:11:58.70 |
+05:33:40.2 |
HIP 45150 |
5.60 |
| 2026-02-17 12:00 |
09:11:57.30 |
+05:33:46.9 |
HIP 45150 |
5.68 |
| 2026-02-18 00:00 |
09:11:55.90 |
+05:33:53.6 |
HIP 45150 |
5.77 |
| 2026-02-18 12:00 |
09:11:54.51 |
+05:34:00.4 |
HIP 45150 |
5.89 |
| 2026-02-19 00:00 |
09:11:53.12 |
+05:34:07.1 |
HIP 45150 |
6.03 |
| 2026-02-19 12:00 |
09:11:51.73 |
+05:34:13.9 |
HIP 45150 |
6.19 |
| 2026-02-20 00:00 |
09:11:50.34 |
+05:34:20.7 |
HIP 45150 |
6.37 |
| 2026-02-20 12:00 |
09:11:48.96 |
+05:34:27.5 |
HIP 45150 |
6.56 |
| 2026-02-21 00:00 |
09:11:47.58 |
+05:34:34.3 |
HIP 45150 |
6.76 |
| 2026-02-21 12:00 |
09:11:46.21 |
+05:34:41.2 |
HIP 45150 |
6.98 |
| 2026-02-22 00:00 |
09:11:44.84 |
+05:34:48.1 |
HIP 45150 |
7.21 |
| 2026-02-22 12:00 |
09:11:43.47 |
+05:34:54.9 |
HIP 45150 |
7.45 |
| 2026-02-23 00:00 |
09:11:42.11 |
+05:35:01.8 |
HIP 45150 |
7.69 |
| 2026-02-23 12:00 |
09:11:40.75 |
+05:35:08.7 |
HIP 45150 |
7.95 |
| 2026-02-24 00:00 |
09:11:39.39 |
+05:35:15.7 |
HIP 45150 |
8.21 |