| Parameter |
Value |
| Designation |
C/1991 Q1 (McNaught-Russell) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1992-05-03T10:52:23.122560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:41Z |
| Obs used |
29 |
| NEO |
- |
| M1 |
5.000 |
| K1 |
15.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1992-08-12.0000000 |
| e |
0.99448867 |
| q (au) |
3.193967 |
| a (au) |
579.527657 |
| i (deg) |
90.506206 |
| Ω (om, deg) |
120.462895 |
| ω (w, deg) |
257.232969 |
| M (ma, deg) |
0.007103 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.015 + 2.500\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.015 |
| n |
2.500 |
| gf |
0.998 |
| gb |
-0.876 |
| k |
0.968 |
| δ90 |
9.995 |
| 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 |
09:39:18.10 |
+67:38:57.0 |
HIP 47348 |
22.05 |
| 2026-06-01 12:00 |
09:39:19.79 |
+67:38:32.5 |
HIP 47401 |
22.22 |
| 2026-06-02 00:00 |
09:39:21.53 |
+67:38:07.9 |
HIP 47401 |
21.80 |
| 2026-06-02 12:00 |
09:39:23.30 |
+67:37:43.4 |
HIP 47401 |
21.39 |
| 2026-06-03 00:00 |
09:39:25.11 |
+67:37:18.9 |
HIP 47401 |
20.98 |
| 2026-06-03 12:00 |
09:39:26.96 |
+67:36:54.4 |
HIP 47401 |
20.57 |
| 2026-06-04 00:00 |
09:39:28.85 |
+67:36:29.9 |
HIP 47401 |
20.16 |
| 2026-06-04 12:00 |
09:39:30.78 |
+67:36:05.5 |
HIP 47401 |
19.75 |
| 2026-06-05 00:00 |
09:39:32.75 |
+67:35:41.1 |
HIP 47401 |
19.35 |
| 2026-06-05 12:00 |
09:39:34.76 |
+67:35:16.8 |
HIP 47401 |
18.95 |
| 2026-06-06 00:00 |
09:39:36.81 |
+67:34:52.4 |
HIP 47401 |
18.55 |
| 2026-06-06 12:00 |
09:39:38.90 |
+67:34:28.1 |
HIP 47401 |
18.16 |
| 2026-06-07 00:00 |
09:39:41.02 |
+67:34:03.9 |
HIP 47401 |
17.77 |
| 2026-06-07 12:00 |
09:39:43.19 |
+67:33:39.7 |
HIP 47401 |
17.38 |
| 2026-06-08 00:00 |
09:39:45.39 |
+67:33:15.5 |
HIP 47401 |
17.00 |
| 2026-06-08 12:00 |
09:39:47.63 |
+67:32:51.4 |
HIP 47401 |
16.63 |
| 2026-06-09 00:00 |
09:39:49.91 |
+67:32:27.3 |
HIP 47401 |
16.25 |
| 2026-06-09 12:00 |
09:39:52.23 |
+67:32:03.3 |
HIP 47401 |
15.89 |
| 2026-06-10 00:00 |
09:39:54.58 |
+67:31:39.3 |
HIP 47401 |
15.53 |
| 2026-06-10 12:00 |
09:39:56.97 |
+67:31:15.3 |
HIP 47401 |
15.17 |
| 2026-06-11 00:00 |
09:39:59.40 |
+67:30:51.4 |
HIP 47401 |
14.83 |
| 2026-06-11 12:00 |
09:40:01.87 |
+67:30:27.6 |
HIP 47401 |
14.49 |
| 2026-06-12 00:00 |
09:40:04.37 |
+67:30:03.8 |
HIP 47401 |
14.16 |
| 2026-06-12 12:00 |
09:40:06.92 |
+67:29:40.1 |
HIP 47401 |
13.85 |
| 2026-06-13 00:00 |
09:40:09.49 |
+67:29:16.4 |
HIP 47401 |
13.54 |
| 2026-06-13 12:00 |
09:40:12.11 |
+67:28:52.8 |
HIP 47401 |
13.24 |
| 2026-06-14 00:00 |
09:40:14.76 |
+67:28:29.2 |
HIP 47401 |
12.96 |
| 2026-06-14 12:00 |
09:40:17.44 |
+67:28:05.7 |
HIP 47401 |
12.68 |
| 2026-06-15 00:00 |
09:40:20.17 |
+67:27:42.3 |
HIP 47401 |
12.43 |
| 2026-06-15 12:00 |
09:40:22.92 |
+67:27:19.0 |
HIP 47401 |
12.19 |
| 2026-06-16 00:00 |
09:40:25.72 |
+67:26:55.7 |
HIP 47401 |
11.96 |
| 2026-06-16 12:00 |
09:40:28.54 |
+67:26:32.4 |
HIP 47401 |
11.75 |
| 2026-06-17 00:00 |
09:40:31.41 |
+67:26:09.3 |
HIP 47401 |
11.56 |
| 2026-06-17 12:00 |
09:40:34.30 |
+67:25:46.2 |
HIP 47401 |
11.39 |
| 2026-06-18 00:00 |
09:40:37.23 |
+67:25:23.2 |
HIP 47401 |
11.24 |
| 2026-06-18 12:00 |
09:40:40.20 |
+67:25:00.3 |
HIP 47401 |
11.11 |
| 2026-06-19 00:00 |
09:40:43.20 |
+67:24:37.4 |
HIP 47401 |
11.01 |
| 2026-06-19 12:00 |
09:40:46.23 |
+67:24:14.7 |
HIP 47401 |
10.93 |
| 2026-06-20 00:00 |
09:40:49.30 |
+67:23:52.0 |
HIP 47401 |
10.87 |
| 2026-06-20 12:00 |
09:40:52.40 |
+67:23:29.4 |
HIP 47401 |
10.83 |
| 2026-06-21 00:00 |
09:40:55.53 |
+67:23:06.9 |
HIP 47401 |
10.82 |
| 2026-06-21 12:00 |
09:40:58.69 |
+67:22:44.4 |
HIP 47401 |
10.84 |
| 2026-06-22 00:00 |
09:41:01.89 |
+67:22:22.1 |
HIP 47401 |
10.88 |