C/1931 O1 (Nagata)
| Parameter |
Value |
| Designation |
C/1931 O1 (Nagata) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1931-06-11T17:58:51.191040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:03Z |
| Obs used |
33 |
| NEO |
- |
| M1 |
5.700 |
| K1 |
4.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1931-10-05.0000000 |
| e |
0.97845116 |
| q (au) |
1.046195 |
| a (au) |
48.549944 |
| i (deg) |
42.302413 |
| Ω (om, deg) |
192.252622 |
| ω (w, deg) |
320.091135 |
| M (ma, deg) |
0.335788 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.469 + 3.539\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.469 |
| n |
3.539 |
| gf |
0.994 |
| gb |
-0.700 |
| k |
0.800 |
| δ90 |
9.978 |
| 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 |
21:50:09.55 |
+16:34:11.9 |
HIP 107917 |
42.16 |
| 2026-02-03 12:00 |
21:50:10.94 |
+16:34:15.8 |
HIP 107917 |
41.92 |
| 2026-02-04 00:00 |
21:50:12.34 |
+16:34:19.7 |
HIP 107917 |
41.68 |
| 2026-02-04 12:00 |
21:50:13.73 |
+16:34:23.8 |
HIP 107917 |
41.43 |
| 2026-02-05 00:00 |
21:50:15.13 |
+16:34:28.0 |
HIP 107917 |
41.19 |
| 2026-02-05 12:00 |
21:50:16.54 |
+16:34:32.3 |
HIP 107917 |
40.94 |
| 2026-02-06 00:00 |
21:50:17.94 |
+16:34:36.7 |
HIP 107917 |
40.70 |
| 2026-02-06 12:00 |
21:50:19.35 |
+16:34:41.2 |
HIP 107917 |
40.45 |
| 2026-02-07 00:00 |
21:50:20.75 |
+16:34:45.8 |
HIP 107917 |
40.21 |
| 2026-02-07 12:00 |
21:50:22.16 |
+16:34:50.4 |
HIP 107917 |
39.97 |
| 2026-02-08 00:00 |
21:50:23.57 |
+16:34:55.2 |
HIP 107917 |
39.72 |
| 2026-02-08 12:00 |
21:50:24.98 |
+16:35:00.1 |
HIP 107917 |
39.48 |
| 2026-02-09 00:00 |
21:50:26.40 |
+16:35:05.0 |
HIP 107917 |
39.23 |
| 2026-02-09 12:00 |
21:50:27.81 |
+16:35:10.1 |
HIP 107917 |
38.99 |
| 2026-02-10 00:00 |
21:50:29.23 |
+16:35:15.3 |
HIP 107917 |
38.74 |
| 2026-02-10 12:00 |
21:50:30.64 |
+16:35:20.5 |
HIP 107917 |
38.50 |
| 2026-02-11 00:00 |
21:50:32.06 |
+16:35:25.9 |
HIP 107917 |
38.25 |
| 2026-02-11 12:00 |
21:50:33.48 |
+16:35:31.3 |
HIP 107917 |
38.01 |
| 2026-02-12 00:00 |
21:50:34.89 |
+16:35:36.9 |
HIP 107917 |
37.76 |
| 2026-02-12 12:00 |
21:50:36.31 |
+16:35:42.5 |
HIP 107917 |
37.52 |
| 2026-02-13 00:00 |
21:50:37.73 |
+16:35:48.2 |
HIP 107917 |
37.28 |
| 2026-02-13 12:00 |
21:50:39.15 |
+16:35:54.0 |
HIP 107917 |
37.03 |
| 2026-02-14 00:00 |
21:50:40.57 |
+16:36:00.0 |
HIP 107917 |
36.79 |
| 2026-02-14 12:00 |
21:50:41.99 |
+16:36:05.9 |
HIP 107917 |
36.55 |
| 2026-02-15 00:00 |
21:50:43.41 |
+16:36:12.0 |
HIP 107917 |
36.31 |
| 2026-02-15 12:00 |
21:50:44.83 |
+16:36:18.2 |
HIP 107917 |
36.07 |
| 2026-02-16 00:00 |
21:50:46.25 |
+16:36:24.5 |
HIP 107917 |
35.83 |
| 2026-02-16 12:00 |
21:50:47.67 |
+16:36:30.9 |
HIP 107917 |
35.59 |
| 2026-02-17 00:00 |
21:50:49.09 |
+16:36:37.3 |
HIP 107917 |
35.35 |
| 2026-02-17 12:00 |
21:50:50.50 |
+16:36:43.9 |
HIP 107917 |
35.11 |
| 2026-02-18 00:00 |
21:50:51.92 |
+16:36:50.5 |
HIP 107917 |
34.87 |
| 2026-02-18 12:00 |
21:50:53.34 |
+16:36:57.2 |
HIP 107917 |
34.63 |
| 2026-02-19 00:00 |
21:50:54.75 |
+16:37:04.0 |
HIP 107917 |
34.40 |
| 2026-02-19 12:00 |
21:50:56.17 |
+16:37:10.9 |
HIP 107917 |
34.16 |
| 2026-02-20 00:00 |
21:50:57.58 |
+16:37:17.9 |
HIP 107917 |
33.93 |
| 2026-02-20 12:00 |
21:50:58.99 |
+16:37:25.0 |
HIP 107917 |
33.69 |
| 2026-02-21 00:00 |
21:51:00.41 |
+16:37:32.1 |
HIP 107917 |
33.46 |
| 2026-02-21 12:00 |
21:51:01.82 |
+16:37:39.3 |
HIP 107917 |
33.23 |
| 2026-02-22 00:00 |
21:51:03.22 |
+16:37:46.6 |
HIP 107917 |
33.00 |
| 2026-02-22 12:00 |
21:51:04.63 |
+16:37:54.0 |
HIP 107917 |
32.77 |
| 2026-02-23 00:00 |
21:51:06.03 |
+16:38:01.5 |
HIP 107917 |
32.54 |
| 2026-02-23 12:00 |
21:51:07.44 |
+16:38:09.1 |
HIP 107917 |
32.31 |
| 2026-02-24 00:00 |
21:51:08.84 |
+16:38:16.7 |
HIP 107917 |
32.09 |