| 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) |
| 2026-05-12 00:00 |
10:47:39.37 |
+64:11:29.9 |
HIP 52790 |
11.41 |
| 2026-05-12 12:00 |
10:47:38.06 |
+64:11:12.2 |
HIP 52790 |
11.70 |
| 2026-05-13 00:00 |
10:47:36.77 |
+64:10:54.5 |
HIP 52790 |
11.99 |
| 2026-05-13 12:00 |
10:47:35.51 |
+64:10:36.6 |
HIP 52790 |
12.28 |
| 2026-05-14 00:00 |
10:47:34.28 |
+64:10:18.6 |
HIP 52790 |
12.58 |
| 2026-05-14 12:00 |
10:47:33.08 |
+64:10:00.5 |
HIP 52790 |
12.88 |
| 2026-05-15 00:00 |
10:47:31.91 |
+64:09:42.4 |
HIP 52790 |
13.19 |
| 2026-05-15 12:00 |
10:47:30.78 |
+64:09:24.1 |
HIP 52790 |
13.49 |
| 2026-05-16 00:00 |
10:47:29.67 |
+64:09:05.8 |
HIP 52790 |
13.80 |
| 2026-05-16 12:00 |
10:47:28.59 |
+64:08:47.4 |
HIP 52790 |
14.11 |
| 2026-05-17 00:00 |
10:47:27.54 |
+64:08:28.9 |
HIP 52790 |
14.43 |
| 2026-05-17 12:00 |
10:47:26.52 |
+64:08:10.3 |
HIP 52790 |
14.74 |
| 2026-05-18 00:00 |
10:47:25.53 |
+64:07:51.6 |
HIP 52790 |
15.06 |
| 2026-05-18 12:00 |
10:47:24.57 |
+64:07:32.8 |
HIP 52790 |
15.38 |
| 2026-05-19 00:00 |
10:47:23.64 |
+64:07:14.0 |
HIP 52790 |
15.70 |
| 2026-05-19 12:00 |
10:47:22.75 |
+64:06:55.0 |
HIP 52790 |
16.02 |
| 2026-05-20 00:00 |
10:47:21.88 |
+64:06:36.0 |
HIP 52790 |
16.34 |
| 2026-05-20 12:00 |
10:47:21.04 |
+64:06:16.9 |
HIP 52790 |
16.67 |
| 2026-05-21 00:00 |
10:47:20.23 |
+64:05:57.8 |
HIP 52790 |
16.99 |
| 2026-05-21 12:00 |
10:47:19.45 |
+64:05:38.6 |
HIP 52790 |
17.32 |
| 2026-05-22 00:00 |
10:47:18.71 |
+64:05:19.3 |
HIP 52790 |
17.65 |
| 2026-05-22 12:00 |
10:47:17.99 |
+64:04:59.9 |
HIP 52790 |
17.98 |
| 2026-05-23 00:00 |
10:47:17.30 |
+64:04:40.5 |
HIP 52790 |
18.31 |
| 2026-05-23 12:00 |
10:47:16.65 |
+64:04:20.9 |
HIP 52790 |
18.64 |
| 2026-05-24 00:00 |
10:47:16.02 |
+64:04:01.4 |
HIP 52790 |
18.97 |
| 2026-05-24 12:00 |
10:47:15.43 |
+64:03:41.7 |
HIP 52790 |
19.30 |
| 2026-05-25 00:00 |
10:47:14.86 |
+64:03:22.0 |
HIP 52790 |
19.63 |
| 2026-05-25 12:00 |
10:47:14.33 |
+64:03:02.3 |
HIP 52790 |
19.97 |
| 2026-05-26 00:00 |
10:47:13.82 |
+64:02:42.5 |
HIP 52790 |
20.30 |
| 2026-05-26 12:00 |
10:47:13.34 |
+64:02:22.6 |
HIP 52929 |
20.28 |
| 2026-05-27 00:00 |
10:47:12.90 |
+64:02:02.7 |
HIP 52929 |
20.10 |
| 2026-05-27 12:00 |
10:47:12.48 |
+64:01:42.7 |
HIP 52929 |
19.91 |
| 2026-05-28 00:00 |
10:47:12.10 |
+64:01:22.6 |
HIP 52929 |
19.73 |
| 2026-05-28 12:00 |
10:47:11.74 |
+64:01:02.5 |
HIP 52929 |
19.54 |
| 2026-05-29 00:00 |
10:47:11.42 |
+64:00:42.4 |
HIP 52929 |
19.36 |
| 2026-05-29 12:00 |
10:47:11.12 |
+64:00:22.2 |
HIP 52929 |
19.18 |
| 2026-05-30 00:00 |
10:47:10.86 |
+64:00:02.0 |
HIP 52929 |
19.00 |
| 2026-05-30 12:00 |
10:47:10.62 |
+63:59:41.7 |
HIP 52929 |
18.82 |
| 2026-05-31 00:00 |
10:47:10.42 |
+63:59:21.3 |
HIP 52929 |
18.64 |
| 2026-05-31 12:00 |
10:47:10.24 |
+63:59:01.0 |
HIP 52929 |
18.46 |
| 2026-06-01 00:00 |
10:47:10.10 |
+63:58:40.5 |
HIP 52929 |
18.29 |
| 2026-06-01 12:00 |
10:47:09.98 |
+63:58:20.1 |
HIP 52929 |
18.11 |
| 2026-06-02 00:00 |
10:47:09.90 |
+63:57:59.6 |
HIP 52929 |
17.94 |