メタデータ
| 項目 |
値 |
| Designation |
C/1978 G2 (McNaught-Tritton) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1978-08-23T23:05:11.348160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:27Z |
| Obs used |
5 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1978-08-28.0000000 |
| e |
1.00462671 |
| q (au) |
6.284334 |
| a (au) |
-1358.272229 |
| i (deg) |
153.180957 |
| Ω (om, deg) |
72.213979 |
| ω (w, deg) |
229.460098 |
| M (ma, deg) |
0.000080 |
等級
散乱 + 全体線形
$$
M_a = (1.129 + 5.747\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
1.129 |
| n |
5.747 |
| gf |
0.999 |
| gb |
-0.886 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
03:44:36.99 |
+26:11:35.6 |
HIP 17525 |
9.19 |
| 2026-06-01 12:00 |
03:44:38.68 |
+26:11:41.9 |
HIP 17525 |
8.84 |
| 2026-06-02 00:00 |
03:44:40.36 |
+26:11:48.2 |
HIP 17525 |
8.49 |
| 2026-06-02 12:00 |
03:44:42.05 |
+26:11:54.5 |
HIP 17525 |
8.14 |
| 2026-06-03 00:00 |
03:44:43.73 |
+26:12:00.8 |
HIP 17525 |
7.80 |
| 2026-06-03 12:00 |
03:44:45.40 |
+26:12:07.2 |
HIP 17525 |
7.46 |
| 2026-06-04 00:00 |
03:44:47.07 |
+26:12:13.5 |
HIP 17525 |
7.13 |
| 2026-06-04 12:00 |
03:44:48.74 |
+26:12:19.9 |
HIP 17525 |
6.81 |
| 2026-06-05 00:00 |
03:44:50.40 |
+26:12:26.2 |
HIP 17525 |
6.49 |
| 2026-06-05 12:00 |
03:44:52.06 |
+26:12:32.6 |
HIP 17525 |
6.18 |
| 2026-06-06 00:00 |
03:44:53.72 |
+26:12:39.0 |
HIP 17525 |
5.88 |
| 2026-06-06 12:00 |
03:44:55.37 |
+26:12:45.4 |
HIP 17525 |
5.60 |
| 2026-06-07 00:00 |
03:44:57.02 |
+26:12:51.8 |
HIP 17525 |
5.32 |
| 2026-06-07 12:00 |
03:44:58.66 |
+26:12:58.2 |
HIP 17525 |
5.06 |
| 2026-06-08 00:00 |
03:45:00.30 |
+26:13:04.6 |
HIP 17525 |
4.82 |
| 2026-06-08 12:00 |
03:45:01.93 |
+26:13:11.0 |
HIP 17525 |
4.59 |
| 2026-06-09 00:00 |
03:45:03.56 |
+26:13:17.5 |
HIP 17525 |
4.39 |
| 2026-06-09 12:00 |
03:45:05.18 |
+26:13:23.9 |
HIP 17525 |
4.21 |
| 2026-06-10 00:00 |
03:45:06.80 |
+26:13:30.4 |
HIP 17525 |
4.06 |
| 2026-06-10 12:00 |
03:45:08.41 |
+26:13:36.8 |
HIP 17525 |
3.94 |
| 2026-06-11 00:00 |
03:45:10.02 |
+26:13:43.3 |
HIP 17525 |
3.86 |
| 2026-06-11 12:00 |
03:45:11.62 |
+26:13:49.7 |
HIP 17525 |
3.81 |
| 2026-06-12 00:00 |
03:45:13.22 |
+26:13:56.2 |
HIP 17525 |
3.79 |
| 2026-06-12 12:00 |
03:45:14.81 |
+26:14:02.6 |
HIP 17525 |
3.81 |
| 2026-06-13 00:00 |
03:45:16.40 |
+26:14:09.1 |
HIP 17525 |
3.87 |
| 2026-06-13 12:00 |
03:45:17.98 |
+26:14:15.6 |
HIP 17525 |
3.96 |
| 2026-06-14 00:00 |
03:45:19.55 |
+26:14:22.0 |
HIP 17525 |
4.08 |
| 2026-06-14 12:00 |
03:45:21.12 |
+26:14:28.5 |
HIP 17525 |
4.23 |
| 2026-06-15 00:00 |
03:45:22.68 |
+26:14:35.0 |
HIP 17525 |
4.40 |
| 2026-06-15 12:00 |
03:45:24.24 |
+26:14:41.5 |
HIP 17525 |
4.60 |
| 2026-06-16 00:00 |
03:45:25.78 |
+26:14:47.9 |
HIP 17525 |
4.81 |
| 2026-06-16 12:00 |
03:45:27.33 |
+26:14:54.4 |
HIP 17525 |
5.04 |
| 2026-06-17 00:00 |
03:45:28.86 |
+26:15:00.9 |
HIP 17525 |
5.28 |
| 2026-06-17 12:00 |
03:45:30.39 |
+26:15:07.4 |
HIP 17525 |
5.54 |
| 2026-06-18 00:00 |
03:45:31.91 |
+26:15:13.9 |
HIP 17525 |
5.80 |
| 2026-06-18 12:00 |
03:45:33.42 |
+26:15:20.3 |
HIP 17525 |
6.08 |
| 2026-06-19 00:00 |
03:45:34.93 |
+26:15:26.8 |
HIP 17525 |
6.35 |
| 2026-06-19 12:00 |
03:45:36.43 |
+26:15:33.3 |
HIP 17525 |
6.64 |
| 2026-06-20 00:00 |
03:45:37.92 |
+26:15:39.7 |
HIP 17525 |
6.93 |
| 2026-06-20 12:00 |
03:45:39.41 |
+26:15:46.2 |
HIP 17525 |
7.22 |
| 2026-06-21 00:00 |
03:45:40.88 |
+26:15:52.7 |
HIP 17525 |
7.52 |
| 2026-06-21 12:00 |
03:45:42.35 |
+26:15:59.1 |
HIP 17525 |
7.82 |
| 2026-06-22 00:00 |
03:45:43.81 |
+26:16:05.6 |
HIP 17525 |
8.12 |