| 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
$$
M_a = (13.014 + 2.500\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.014 |
| n |
2.500 |
| gf |
1.000 |
| gb |
-0.876 |
| k |
0.968 |
| 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) |
| 2026-05-12 00:00 |
09:38:45.19 |
+67:55:18.5 |
HIP 47348 |
5.57 |
| 2026-05-12 12:00 |
09:38:45.16 |
+67:54:54.5 |
HIP 47348 |
5.97 |
| 2026-05-13 00:00 |
09:38:45.17 |
+67:54:30.4 |
HIP 47348 |
6.37 |
| 2026-05-13 12:00 |
09:38:45.22 |
+67:54:06.3 |
HIP 47348 |
6.77 |
| 2026-05-14 00:00 |
09:38:45.32 |
+67:53:42.1 |
HIP 47348 |
7.17 |
| 2026-05-14 12:00 |
09:38:45.46 |
+67:53:17.9 |
HIP 47348 |
7.57 |
| 2026-05-15 00:00 |
09:38:45.65 |
+67:52:53.6 |
HIP 47348 |
7.97 |
| 2026-05-15 12:00 |
09:38:45.88 |
+67:52:29.3 |
HIP 47348 |
8.38 |
| 2026-05-16 00:00 |
09:38:46.16 |
+67:52:05.0 |
HIP 47348 |
8.78 |
| 2026-05-16 12:00 |
09:38:46.48 |
+67:51:40.6 |
HIP 47348 |
9.18 |
| 2026-05-17 00:00 |
09:38:46.85 |
+67:51:16.2 |
HIP 47348 |
9.59 |
| 2026-05-17 12:00 |
09:38:47.27 |
+67:50:51.8 |
HIP 47348 |
10.00 |
| 2026-05-18 00:00 |
09:38:47.72 |
+67:50:27.3 |
HIP 47348 |
10.40 |
| 2026-05-18 12:00 |
09:38:48.22 |
+67:50:02.8 |
HIP 47348 |
10.81 |
| 2026-05-19 00:00 |
09:38:48.77 |
+67:49:38.3 |
HIP 47348 |
11.22 |
| 2026-05-19 12:00 |
09:38:49.36 |
+67:49:13.7 |
HIP 47348 |
11.62 |
| 2026-05-20 00:00 |
09:38:50.00 |
+67:48:49.1 |
HIP 47348 |
12.03 |
| 2026-05-20 12:00 |
09:38:50.67 |
+67:48:24.5 |
HIP 47348 |
12.44 |
| 2026-05-21 00:00 |
09:38:51.40 |
+67:47:59.9 |
HIP 47348 |
12.85 |
| 2026-05-21 12:00 |
09:38:52.16 |
+67:47:35.3 |
HIP 47348 |
13.27 |
| 2026-05-22 00:00 |
09:38:52.97 |
+67:47:10.6 |
HIP 47348 |
13.68 |
| 2026-05-22 12:00 |
09:38:53.83 |
+67:46:45.9 |
HIP 47348 |
14.09 |
| 2026-05-23 00:00 |
09:38:54.72 |
+67:46:21.3 |
HIP 47348 |
14.50 |
| 2026-05-23 12:00 |
09:38:55.66 |
+67:45:56.6 |
HIP 47348 |
14.92 |
| 2026-05-24 00:00 |
09:38:56.65 |
+67:45:31.9 |
HIP 47348 |
15.33 |
| 2026-05-24 12:00 |
09:38:57.67 |
+67:45:07.2 |
HIP 47348 |
15.75 |
| 2026-05-25 00:00 |
09:38:58.74 |
+67:44:42.5 |
HIP 47348 |
16.16 |
| 2026-05-25 12:00 |
09:38:59.85 |
+67:44:17.8 |
HIP 47348 |
16.58 |
| 2026-05-26 00:00 |
09:39:01.01 |
+67:43:53.1 |
HIP 47348 |
16.99 |
| 2026-05-26 12:00 |
09:39:02.20 |
+67:43:28.3 |
HIP 47348 |
17.41 |
| 2026-05-27 00:00 |
09:39:03.44 |
+67:43:03.6 |
HIP 47348 |
17.83 |
| 2026-05-27 12:00 |
09:39:04.72 |
+67:42:38.9 |
HIP 47348 |
18.25 |
| 2026-05-28 00:00 |
09:39:06.04 |
+67:42:14.2 |
HIP 47348 |
18.67 |
| 2026-05-28 12:00 |
09:39:07.41 |
+67:41:49.5 |
HIP 47348 |
19.09 |
| 2026-05-29 00:00 |
09:39:08.81 |
+67:41:24.9 |
HIP 47348 |
19.51 |
| 2026-05-29 12:00 |
09:39:10.26 |
+67:41:00.2 |
HIP 47348 |
19.93 |
| 2026-05-30 00:00 |
09:39:11.74 |
+67:40:35.5 |
HIP 47348 |
20.36 |
| 2026-05-30 12:00 |
09:39:13.27 |
+67:40:10.9 |
HIP 47348 |
20.78 |
| 2026-05-31 00:00 |
09:39:14.84 |
+67:39:46.2 |
HIP 47348 |
21.20 |
| 2026-05-31 12:00 |
09:39:16.45 |
+67:39:21.6 |
HIP 47348 |
21.63 |
| 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 |