| 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) |
| 2026-06-01 00:00 |
09:10:02.98 |
+05:51:18.2 |
HIP 44917 |
21.20 |
| 2026-06-01 12:00 |
09:10:03.54 |
+05:51:18.6 |
HIP 44917 |
21.31 |
| 2026-06-02 00:00 |
09:10:04.11 |
+05:51:19.0 |
HIP 44917 |
21.42 |
| 2026-06-02 12:00 |
09:10:04.70 |
+05:51:19.3 |
HIP 44917 |
21.52 |
| 2026-06-03 00:00 |
09:10:05.29 |
+05:51:19.6 |
HIP 44917 |
21.63 |
| 2026-06-03 12:00 |
09:10:05.89 |
+05:51:19.8 |
HIP 44917 |
21.75 |
| 2026-06-04 00:00 |
09:10:06.50 |
+05:51:20.0 |
HIP 44917 |
21.86 |
| 2026-06-04 12:00 |
09:10:07.13 |
+05:51:20.1 |
HIP 44917 |
21.97 |
| 2026-06-05 00:00 |
09:10:07.76 |
+05:51:20.1 |
HIP 44917 |
22.09 |
| 2026-06-05 12:00 |
09:10:08.40 |
+05:51:20.0 |
HIP 44917 |
22.21 |
| 2026-06-06 00:00 |
09:10:09.05 |
+05:51:19.9 |
HIP 44917 |
22.33 |
| 2026-06-06 12:00 |
09:10:09.71 |
+05:51:19.8 |
HIP 44917 |
22.45 |
| 2026-06-07 00:00 |
09:10:10.39 |
+05:51:19.6 |
HIP 44917 |
22.57 |
| 2026-06-07 12:00 |
09:10:11.07 |
+05:51:19.3 |
HIP 44917 |
22.70 |
| 2026-06-08 00:00 |
09:10:11.76 |
+05:51:18.9 |
HIP 44917 |
22.82 |
| 2026-06-08 12:00 |
09:10:12.46 |
+05:51:18.5 |
HIP 44917 |
22.95 |
| 2026-06-09 00:00 |
09:10:13.17 |
+05:51:18.1 |
HIP 44917 |
23.08 |
| 2026-06-09 12:00 |
09:10:13.89 |
+05:51:17.5 |
HIP 44917 |
23.21 |
| 2026-06-10 00:00 |
09:10:14.62 |
+05:51:17.0 |
HIP 44917 |
23.35 |
| 2026-06-10 12:00 |
09:10:15.36 |
+05:51:16.3 |
HIP 44917 |
23.48 |
| 2026-06-11 00:00 |
09:10:16.11 |
+05:51:15.6 |
HIP 44917 |
23.62 |
| 2026-06-11 12:00 |
09:10:16.87 |
+05:51:14.8 |
HIP 44917 |
23.76 |
| 2026-06-12 00:00 |
09:10:17.63 |
+05:51:14.0 |
HIP 44917 |
23.90 |
| 2026-06-12 12:00 |
09:10:18.41 |
+05:51:13.1 |
HIP 44917 |
24.04 |
| 2026-06-13 00:00 |
09:10:19.19 |
+05:51:12.2 |
HIP 44917 |
24.19 |
| 2026-06-13 12:00 |
09:10:19.99 |
+05:51:11.1 |
HIP 44917 |
24.33 |
| 2026-06-14 00:00 |
09:10:20.79 |
+05:51:10.1 |
HIP 44917 |
24.48 |
| 2026-06-14 12:00 |
09:10:21.61 |
+05:51:08.9 |
HIP 44917 |
24.63 |
| 2026-06-15 00:00 |
09:10:22.43 |
+05:51:07.7 |
HIP 44917 |
24.79 |
| 2026-06-15 12:00 |
09:10:23.26 |
+05:51:06.5 |
HIP 44917 |
24.94 |
| 2026-06-16 00:00 |
09:10:24.10 |
+05:51:05.2 |
HIP 44917 |
25.10 |
| 2026-06-16 12:00 |
09:10:24.95 |
+05:51:03.8 |
HIP 44917 |
25.25 |
| 2026-06-17 00:00 |
09:10:25.80 |
+05:51:02.3 |
HIP 44917 |
25.41 |
| 2026-06-17 12:00 |
09:10:26.67 |
+05:51:00.8 |
HIP 44917 |
25.58 |
| 2026-06-18 00:00 |
09:10:27.54 |
+05:50:59.3 |
HIP 44917 |
25.74 |
| 2026-06-18 12:00 |
09:10:28.42 |
+05:50:57.7 |
HIP 44917 |
25.91 |
| 2026-06-19 00:00 |
09:10:29.31 |
+05:50:56.0 |
HIP 44917 |
26.08 |
| 2026-06-19 12:00 |
09:10:30.21 |
+05:50:54.2 |
HIP 44917 |
26.25 |
| 2026-06-20 00:00 |
09:10:31.12 |
+05:50:52.4 |
HIP 44917 |
26.42 |
| 2026-06-20 12:00 |
09:10:32.03 |
+05:50:50.6 |
HIP 44917 |
26.59 |
| 2026-06-21 00:00 |
09:10:32.96 |
+05:50:48.6 |
HIP 44917 |
26.77 |
| 2026-06-21 12:00 |
09:10:33.89 |
+05:50:46.7 |
HIP 44917 |
26.95 |
| 2026-06-22 00:00 |
09:10:34.83 |
+05:50:44.6 |
HIP 44917 |
27.13 |