| 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 |
9.971 |
| 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 |
21:53:26.26 |
+17:12:57.5 |
HIP 107917 |
23.31 |
| 2026-06-01 12:00 |
21:53:25.96 |
+17:13:06.1 |
HIP 107917 |
23.27 |
| 2026-06-02 00:00 |
21:53:25.64 |
+17:13:14.7 |
HIP 107917 |
23.22 |
| 2026-06-02 12:00 |
21:53:25.32 |
+17:13:23.2 |
HIP 107917 |
23.17 |
| 2026-06-03 00:00 |
21:53:24.98 |
+17:13:31.6 |
HIP 107917 |
23.12 |
| 2026-06-03 12:00 |
21:53:24.63 |
+17:13:40.0 |
HIP 107917 |
23.07 |
| 2026-06-04 00:00 |
21:53:24.27 |
+17:13:48.3 |
HIP 107917 |
23.01 |
| 2026-06-04 12:00 |
21:53:23.90 |
+17:13:56.5 |
HIP 107917 |
22.96 |
| 2026-06-05 00:00 |
21:53:23.52 |
+17:14:04.6 |
HIP 107917 |
22.90 |
| 2026-06-05 12:00 |
21:53:23.12 |
+17:14:12.6 |
HIP 107917 |
22.84 |
| 2026-06-06 00:00 |
21:53:22.72 |
+17:14:20.6 |
HIP 107917 |
22.78 |
| 2026-06-06 12:00 |
21:53:22.30 |
+17:14:28.5 |
HIP 107917 |
22.71 |
| 2026-06-07 00:00 |
21:53:21.88 |
+17:14:36.4 |
HIP 107917 |
22.65 |
| 2026-06-07 12:00 |
21:53:21.44 |
+17:14:44.1 |
HIP 107917 |
22.58 |
| 2026-06-08 00:00 |
21:53:20.99 |
+17:14:51.8 |
HIP 107917 |
22.51 |
| 2026-06-08 12:00 |
21:53:20.53 |
+17:14:59.4 |
HIP 107917 |
22.44 |
| 2026-06-09 00:00 |
21:53:20.06 |
+17:15:06.9 |
HIP 107917 |
22.37 |
| 2026-06-09 12:00 |
21:53:19.58 |
+17:15:14.3 |
HIP 107917 |
22.29 |
| 2026-06-10 00:00 |
21:53:19.09 |
+17:15:21.7 |
HIP 107917 |
22.21 |
| 2026-06-10 12:00 |
21:53:18.58 |
+17:15:29.0 |
HIP 107917 |
22.14 |
| 2026-06-11 00:00 |
21:53:18.07 |
+17:15:36.1 |
HIP 107917 |
22.05 |
| 2026-06-11 12:00 |
21:53:17.54 |
+17:15:43.3 |
HIP 107917 |
21.97 |
| 2026-06-12 00:00 |
21:53:17.01 |
+17:15:50.3 |
HIP 107917 |
21.89 |
| 2026-06-12 12:00 |
21:53:16.46 |
+17:15:57.2 |
HIP 107917 |
21.80 |
| 2026-06-13 00:00 |
21:53:15.90 |
+17:16:04.1 |
HIP 107917 |
21.71 |
| 2026-06-13 12:00 |
21:53:15.34 |
+17:16:10.9 |
HIP 107917 |
21.62 |
| 2026-06-14 00:00 |
21:53:14.76 |
+17:16:17.5 |
HIP 107917 |
21.53 |
| 2026-06-14 12:00 |
21:53:14.17 |
+17:16:24.1 |
HIP 107917 |
21.44 |
| 2026-06-15 00:00 |
21:53:13.57 |
+17:16:30.7 |
HIP 107917 |
21.35 |
| 2026-06-15 12:00 |
21:53:12.96 |
+17:16:37.1 |
HIP 107917 |
21.25 |
| 2026-06-16 00:00 |
21:53:12.34 |
+17:16:43.4 |
HIP 107917 |
21.15 |
| 2026-06-16 12:00 |
21:53:11.70 |
+17:16:49.7 |
HIP 107917 |
21.05 |
| 2026-06-17 00:00 |
21:53:11.06 |
+17:16:55.9 |
HIP 107917 |
20.95 |
| 2026-06-17 12:00 |
21:53:10.41 |
+17:17:01.9 |
HIP 107917 |
20.84 |
| 2026-06-18 00:00 |
21:53:09.75 |
+17:17:07.9 |
HIP 107917 |
20.74 |
| 2026-06-18 12:00 |
21:53:09.08 |
+17:17:13.8 |
HIP 107917 |
20.63 |
| 2026-06-19 00:00 |
21:53:08.39 |
+17:17:19.6 |
HIP 107917 |
20.52 |
| 2026-06-19 12:00 |
21:53:07.70 |
+17:17:25.4 |
HIP 107917 |
20.41 |
| 2026-06-20 00:00 |
21:53:07.00 |
+17:17:31.0 |
HIP 107917 |
20.30 |
| 2026-06-20 12:00 |
21:53:06.29 |
+17:17:36.5 |
HIP 107917 |
20.19 |
| 2026-06-21 00:00 |
21:53:05.56 |
+17:17:42.0 |
HIP 107917 |
20.07 |
| 2026-06-21 12:00 |
21:53:04.83 |
+17:17:47.3 |
HIP 107917 |
19.95 |
| 2026-06-22 00:00 |
21:53:04.09 |
+17:17:52.6 |
HIP 107917 |
19.84 |