C/1980 R1 (Russell)
| Parameter |
Value |
| Designation |
C/1980 R1 (Russell) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1981-03-06T03:48:13.415040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:29Z |
| Obs used |
17 |
| NEO |
- |
| M1 |
10.400 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1980-10-13.0000000 |
| e |
1.00182492 |
| q (au) |
2.112445 |
| a (au) |
-1157.557626 |
| i (deg) |
128.706527 |
| Ω (om, deg) |
232.786557 |
| ω (w, deg) |
297.189306 |
| M (ma, deg) |
-0.003608 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.779 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.779 |
| n |
6.000 |
| gf |
0.995 |
| gb |
-1.000 |
| 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 |
10:57:54.54 |
+64:17:20.6 |
HIP 53463 |
18.57 |
| 2026-02-03 12:00 |
10:57:51.20 |
+64:17:36.5 |
HIP 53463 |
18.14 |
| 2026-02-04 00:00 |
10:57:47.84 |
+64:17:52.3 |
HIP 53463 |
17.72 |
| 2026-02-04 12:00 |
10:57:44.46 |
+64:18:07.9 |
HIP 53463 |
17.29 |
| 2026-02-05 00:00 |
10:57:41.07 |
+64:18:23.4 |
HIP 53463 |
16.87 |
| 2026-02-05 12:00 |
10:57:37.66 |
+64:18:38.8 |
HIP 53463 |
16.45 |
| 2026-02-06 00:00 |
10:57:34.24 |
+64:18:53.9 |
HIP 53463 |
16.04 |
| 2026-02-06 12:00 |
10:57:30.80 |
+64:19:09.0 |
HIP 53463 |
15.62 |
| 2026-02-07 00:00 |
10:57:27.34 |
+64:19:23.8 |
HIP 53463 |
15.21 |
| 2026-02-07 12:00 |
10:57:23.87 |
+64:19:38.5 |
HIP 53463 |
14.81 |
| 2026-02-08 00:00 |
10:57:20.39 |
+64:19:53.1 |
HIP 53463 |
14.40 |
| 2026-02-08 12:00 |
10:57:16.89 |
+64:20:07.4 |
HIP 53463 |
14.01 |
| 2026-02-09 00:00 |
10:57:13.38 |
+64:20:21.6 |
HIP 53463 |
13.61 |
| 2026-02-09 12:00 |
10:57:09.85 |
+64:20:35.7 |
HIP 53463 |
13.23 |
| 2026-02-10 00:00 |
10:57:06.32 |
+64:20:49.6 |
HIP 53463 |
12.85 |
| 2026-02-10 12:00 |
10:57:02.76 |
+64:21:03.3 |
HIP 53463 |
12.47 |
| 2026-02-11 00:00 |
10:56:59.20 |
+64:21:16.8 |
HIP 53463 |
12.10 |
| 2026-02-11 12:00 |
10:56:55.62 |
+64:21:30.2 |
HIP 53463 |
11.74 |
| 2026-02-12 00:00 |
10:56:52.03 |
+64:21:43.4 |
HIP 53463 |
11.39 |
| 2026-02-12 12:00 |
10:56:48.43 |
+64:21:56.5 |
HIP 53463 |
11.04 |
| 2026-02-13 00:00 |
10:56:44.82 |
+64:22:09.3 |
HIP 53463 |
10.71 |
| 2026-02-13 12:00 |
10:56:41.19 |
+64:22:22.0 |
HIP 53463 |
10.38 |
| 2026-02-14 00:00 |
10:56:37.56 |
+64:22:34.5 |
HIP 53463 |
10.07 |
| 2026-02-14 12:00 |
10:56:33.91 |
+64:22:46.9 |
HIP 53463 |
9.77 |
| 2026-02-15 00:00 |
10:56:30.25 |
+64:22:59.0 |
HIP 53463 |
9.49 |
| 2026-02-15 12:00 |
10:56:26.59 |
+64:23:11.0 |
HIP 53463 |
9.22 |
| 2026-02-16 00:00 |
10:56:22.91 |
+64:23:22.8 |
HIP 53463 |
8.96 |
| 2026-02-16 12:00 |
10:56:19.22 |
+64:23:34.4 |
HIP 53463 |
8.73 |
| 2026-02-17 00:00 |
10:56:15.53 |
+64:23:45.9 |
HIP 53463 |
8.51 |
| 2026-02-17 12:00 |
10:56:11.82 |
+64:23:57.2 |
HIP 53463 |
8.32 |
| 2026-02-18 00:00 |
10:56:08.11 |
+64:24:08.2 |
HIP 53463 |
8.15 |
| 2026-02-18 12:00 |
10:56:04.39 |
+64:24:19.1 |
HIP 53463 |
8.00 |
| 2026-02-19 00:00 |
10:56:00.66 |
+64:24:29.8 |
HIP 53463 |
7.87 |
| 2026-02-19 12:00 |
10:55:56.93 |
+64:24:40.4 |
HIP 53463 |
7.77 |
| 2026-02-20 00:00 |
10:55:53.18 |
+64:24:50.7 |
HIP 53463 |
7.70 |
| 2026-02-20 12:00 |
10:55:49.43 |
+64:25:00.9 |
HIP 53463 |
7.66 |
| 2026-02-21 00:00 |
10:55:45.67 |
+64:25:10.8 |
HIP 53463 |
7.65 |
| 2026-02-21 12:00 |
10:55:41.91 |
+64:25:20.6 |
HIP 53463 |
7.66 |
| 2026-02-22 00:00 |
10:55:38.14 |
+64:25:30.2 |
HIP 53463 |
7.70 |
| 2026-02-22 12:00 |
10:55:34.37 |
+64:25:39.6 |
HIP 53463 |
7.77 |
| 2026-02-23 00:00 |
10:55:30.59 |
+64:25:48.8 |
HIP 53463 |
7.86 |
| 2026-02-23 12:00 |
10:55:26.80 |
+64:25:57.9 |
HIP 53463 |
7.98 |
| 2026-02-24 00:00 |
10:55:23.01 |
+64:26:06.7 |
HIP 53463 |
8.13 |