| 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
$$
M_a = (7.710 + 5.798\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.710 |
| n |
5.798 |
| gf |
1.000 |
| gb |
-0.782 |
| k |
0.800 |
| δ90 |
9.999 |
| 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) |
| 2026-09-20 00:00 |
09:14:12.77 |
+05:33:00.2 |
HIP 45420 |
16.66 |
| 2026-09-20 12:00 |
09:14:13.77 |
+05:32:52.6 |
HIP 45420 |
16.40 |
| 2026-09-21 00:00 |
09:14:14.76 |
+05:32:44.9 |
HIP 45420 |
16.14 |
| 2026-09-21 12:00 |
09:14:15.75 |
+05:32:37.3 |
HIP 45420 |
15.88 |
| 2026-09-22 00:00 |
09:14:16.73 |
+05:32:29.6 |
HIP 45420 |
15.63 |
| 2026-09-22 12:00 |
09:14:17.69 |
+05:32:22.0 |
HIP 45420 |
15.37 |
| 2026-09-23 00:00 |
09:14:18.66 |
+05:32:14.4 |
HIP 45420 |
15.12 |
| 2026-09-23 12:00 |
09:14:19.61 |
+05:32:06.8 |
HIP 45420 |
14.88 |
| 2026-09-24 00:00 |
09:14:20.55 |
+05:31:59.2 |
HIP 45420 |
14.63 |
| 2026-09-24 12:00 |
09:14:21.49 |
+05:31:51.6 |
HIP 45420 |
14.39 |
| 2026-09-25 00:00 |
09:14:22.42 |
+05:31:44.1 |
HIP 45420 |
14.15 |
| 2026-09-25 12:00 |
09:14:23.34 |
+05:31:36.5 |
HIP 45420 |
13.92 |
| 2026-09-26 00:00 |
09:14:24.25 |
+05:31:29.0 |
HIP 45420 |
13.69 |
| 2026-09-26 12:00 |
09:14:25.16 |
+05:31:21.5 |
HIP 45420 |
13.46 |
| 2026-09-27 00:00 |
09:14:26.05 |
+05:31:14.0 |
HIP 45420 |
13.23 |
| 2026-09-27 12:00 |
09:14:26.94 |
+05:31:06.5 |
HIP 45420 |
13.01 |
| 2026-09-28 00:00 |
09:14:27.82 |
+05:30:59.0 |
HIP 45420 |
12.79 |
| 2026-09-28 12:00 |
09:14:28.69 |
+05:30:51.6 |
HIP 45420 |
12.57 |
| 2026-09-29 00:00 |
09:14:29.55 |
+05:30:44.1 |
HIP 45420 |
12.36 |
| 2026-09-29 12:00 |
09:14:30.40 |
+05:30:36.7 |
HIP 45420 |
12.15 |
| 2026-09-30 00:00 |
09:14:31.25 |
+05:30:29.3 |
HIP 45420 |
11.94 |
| 2026-09-30 12:00 |
09:14:32.08 |
+05:30:22.0 |
HIP 45420 |
11.74 |
| 2026-10-01 00:00 |
09:14:32.91 |
+05:30:14.6 |
HIP 45420 |
11.54 |
| 2026-10-01 12:00 |
09:14:33.72 |
+05:30:07.2 |
HIP 45420 |
11.35 |
| 2026-10-02 00:00 |
09:14:34.53 |
+05:30:00.0 |
HIP 45420 |
11.16 |
| 2026-10-02 12:00 |
09:14:35.33 |
+05:29:52.6 |
HIP 45420 |
10.97 |
| 2026-10-03 00:00 |
09:14:36.12 |
+05:29:45.3 |
HIP 45420 |
10.79 |
| 2026-10-03 12:00 |
09:14:36.90 |
+05:29:38.1 |
HIP 45420 |
10.61 |
| 2026-10-04 00:00 |
09:14:37.67 |
+05:29:30.9 |
HIP 45420 |
10.43 |
| 2026-10-04 12:00 |
09:14:38.43 |
+05:29:23.6 |
HIP 45420 |
10.26 |
| 2026-10-05 00:00 |
09:14:39.19 |
+05:29:16.5 |
HIP 45420 |
10.09 |
| 2026-10-05 12:00 |
09:14:39.93 |
+05:29:09.3 |
HIP 45420 |
9.93 |
| 2026-10-06 00:00 |
09:14:40.66 |
+05:29:02.1 |
HIP 45420 |
9.78 |
| 2026-10-06 12:00 |
09:14:41.39 |
+05:28:55.0 |
HIP 45420 |
9.62 |
| 2026-10-07 00:00 |
09:14:42.10 |
+05:28:47.9 |
HIP 45420 |
9.48 |
| 2026-10-07 12:00 |
09:14:42.81 |
+05:28:40.9 |
HIP 45420 |
9.33 |
| 2026-10-08 00:00 |
09:14:43.50 |
+05:28:33.8 |
HIP 45420 |
9.19 |
| 2026-10-08 12:00 |
09:14:44.18 |
+05:28:26.8 |
HIP 45420 |
9.06 |
| 2026-10-09 00:00 |
09:14:44.86 |
+05:28:19.8 |
HIP 45420 |
8.93 |
| 2026-10-09 12:00 |
09:14:45.52 |
+05:28:12.9 |
HIP 45420 |
8.81 |
| 2026-10-10 00:00 |
09:14:46.18 |
+05:28:06.0 |
HIP 45420 |
8.69 |
| 2026-10-10 12:00 |
09:14:46.82 |
+05:27:59.1 |
HIP 45420 |
8.58 |
| 2026-10-11 00:00 |
09:14:47.45 |
+05:27:52.2 |
HIP 45420 |
8.47 |