メタデータ
| 項目 |
値 |
| Designation |
C/2024 G4 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2026-03-21T16:04:17.345280Z |
| Orbit solution date (soln_date, UTC) |
2026-05-08T13:42:11Z |
| Obs used |
585 |
| NEO |
- |
| M1 |
10.400 |
| K1 |
7.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2024-04-10T12:57:43.084800Z |
| Discovery magnitude (MPC) |
21.12 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2025-03-14.0000000 |
| e |
0.99839076 |
| q (au) |
4.900264 |
| a (au) |
3045.080252 |
| i (deg) |
33.026334 |
| Ω (om, deg) |
152.985887 |
| ω (w, deg) |
131.423864 |
| M (ma, deg) |
359.997814 |
等級
散乱 + 全体線形
$$
M_a = (7.314 + 3.940\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.314 |
| n |
3.940 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
10.000 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
20:19:55.52 |
+03:57:55.8 |
HIP 100285 |
7.81 |
| 2026-05-12 12:00 |
20:20:03.28 |
+03:58:46.1 |
HIP 100285 |
5.81 |
| 2026-05-13 00:00 |
20:20:10.86 |
+03:59:35.4 |
HIP 100285 |
3.95 |
| 2026-05-13 12:00 |
20:20:18.26 |
+04:00:23.7 |
HIP 100285 |
2.48 |
| 2026-05-14 00:00 |
20:20:25.48 |
+04:01:11.2 |
HIP 100285 |
2.18 |
| 2026-05-14 12:00 |
20:20:32.52 |
+04:01:57.7 |
HIP 100285 |
3.30 |
| 2026-05-15 00:00 |
20:20:39.39 |
+04:02:43.2 |
HIP 100285 |
4.89 |
| 2026-05-15 12:00 |
20:20:46.07 |
+04:03:27.7 |
HIP 100285 |
6.59 |
| 2026-05-16 00:00 |
20:20:52.58 |
+04:04:11.3 |
HIP 100285 |
8.30 |
| 2026-05-16 12:00 |
20:20:58.91 |
+04:04:53.8 |
HIP 100285 |
9.99 |
| 2026-05-17 00:00 |
20:21:05.06 |
+04:05:35.4 |
HIP 100285 |
11.64 |
| 2026-05-17 12:00 |
20:21:11.03 |
+04:06:15.8 |
HIP 100285 |
13.25 |
| 2026-05-18 00:00 |
20:21:16.82 |
+04:06:55.3 |
HIP 100285 |
14.82 |
| 2026-05-18 12:00 |
20:21:22.43 |
+04:07:33.7 |
HIP 100285 |
16.35 |
| 2026-05-19 00:00 |
20:21:27.86 |
+04:08:11.0 |
HIP 100285 |
17.83 |
| 2026-05-19 12:00 |
20:21:33.12 |
+04:08:47.2 |
HIP 100285 |
19.26 |
| 2026-05-20 00:00 |
20:21:38.19 |
+04:09:22.4 |
HIP 100285 |
20.65 |
| 2026-05-20 12:00 |
20:21:43.09 |
+04:09:56.4 |
HIP 100285 |
21.99 |
| 2026-05-21 00:00 |
20:21:47.80 |
+04:10:29.3 |
HIP 100285 |
23.28 |
| 2026-05-21 12:00 |
20:21:52.34 |
+04:11:01.1 |
HIP 100285 |
24.53 |
| 2026-05-22 00:00 |
20:21:56.70 |
+04:11:31.7 |
HIP 100285 |
25.73 |
| 2026-05-22 12:00 |
20:22:00.88 |
+04:12:01.2 |
HIP 100285 |
26.88 |
| 2026-05-23 00:00 |
20:22:04.89 |
+04:12:29.5 |
HIP 100285 |
27.98 |
| 2026-05-23 12:00 |
20:22:08.71 |
+04:12:56.7 |
HIP 100285 |
29.04 |
| 2026-05-24 00:00 |
20:22:12.36 |
+04:13:22.7 |
HIP 100285 |
30.04 |
| 2026-05-24 12:00 |
20:22:15.83 |
+04:13:47.4 |
HIP 100285 |
31.00 |
| 2026-05-25 00:00 |
20:22:19.13 |
+04:14:11.0 |
HIP 100285 |
31.91 |
| 2026-05-25 12:00 |
20:22:22.25 |
+04:14:33.3 |
HIP 100285 |
32.77 |
| 2026-05-26 00:00 |
20:22:25.19 |
+04:14:54.5 |
HIP 100285 |
33.58 |
| 2026-05-26 12:00 |
20:22:27.95 |
+04:15:14.4 |
HIP 100285 |
34.35 |
| 2026-05-27 00:00 |
20:22:30.54 |
+04:15:33.0 |
HIP 100285 |
35.06 |
| 2026-05-27 12:00 |
20:22:32.96 |
+04:15:50.4 |
HIP 100285 |
35.73 |
| 2026-05-28 00:00 |
20:22:35.20 |
+04:16:06.5 |
HIP 100285 |
36.35 |
| 2026-05-28 12:00 |
20:22:37.26 |
+04:16:21.3 |
HIP 100285 |
36.92 |
| 2026-05-29 00:00 |
20:22:39.15 |
+04:16:34.9 |
HIP 100285 |
37.44 |
| 2026-05-29 12:00 |
20:22:40.86 |
+04:16:47.1 |
HIP 100285 |
37.91 |
| 2026-05-30 00:00 |
20:22:42.40 |
+04:16:58.1 |
HIP 100285 |
38.34 |
| 2026-05-30 12:00 |
20:22:43.77 |
+04:17:07.7 |
HIP 100285 |
38.71 |
| 2026-05-31 00:00 |
20:22:44.96 |
+04:17:16.0 |
HIP 100285 |
39.04 |
| 2026-05-31 12:00 |
20:22:45.98 |
+04:17:22.9 |
HIP 100285 |
39.32 |
| 2026-06-01 00:00 |
20:22:46.82 |
+04:17:28.5 |
HIP 100459 |
39.32 |
| 2026-06-01 12:00 |
20:22:47.49 |
+04:17:32.7 |
HIP 100459 |
39.28 |
| 2026-06-02 00:00 |
20:22:48.00 |
+04:17:35.6 |
HIP 100459 |
39.25 |