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) |
| 2026-09-20 00:00 |
03:46:43.54 |
+26:28:24.1 |
HIP 17609 |
16.33 |
| 2026-09-20 12:00 |
03:46:42.54 |
+26:28:24.3 |
HIP 17609 |
16.26 |
| 2026-09-21 00:00 |
03:46:41.51 |
+26:28:24.4 |
HIP 17609 |
16.19 |
| 2026-09-21 12:00 |
03:46:40.48 |
+26:28:24.4 |
HIP 17609 |
16.12 |
| 2026-09-22 00:00 |
03:46:39.42 |
+26:28:24.4 |
HIP 17609 |
16.06 |
| 2026-09-22 12:00 |
03:46:38.36 |
+26:28:24.4 |
HIP 17609 |
15.99 |
| 2026-09-23 00:00 |
03:46:37.28 |
+26:28:24.3 |
HIP 17609 |
15.93 |
| 2026-09-23 12:00 |
03:46:36.19 |
+26:28:24.1 |
HIP 17609 |
15.87 |
| 2026-09-24 00:00 |
03:46:35.08 |
+26:28:23.9 |
HIP 17609 |
15.81 |
| 2026-09-24 12:00 |
03:46:33.96 |
+26:28:23.6 |
HIP 17609 |
15.75 |
| 2026-09-25 00:00 |
03:46:32.82 |
+26:28:23.3 |
HIP 17609 |
15.70 |
| 2026-09-25 12:00 |
03:46:31.68 |
+26:28:22.9 |
HIP 17609 |
15.65 |
| 2026-09-26 00:00 |
03:46:30.51 |
+26:28:22.5 |
HIP 17609 |
15.60 |
| 2026-09-26 12:00 |
03:46:29.34 |
+26:28:22.0 |
HIP 17609 |
15.55 |
| 2026-09-27 00:00 |
03:46:28.15 |
+26:28:21.5 |
HIP 17609 |
15.51 |
| 2026-09-27 12:00 |
03:46:26.95 |
+26:28:20.9 |
HIP 17609 |
15.47 |
| 2026-09-28 00:00 |
03:46:25.73 |
+26:28:20.2 |
HIP 17609 |
15.43 |
| 2026-09-28 12:00 |
03:46:24.50 |
+26:28:19.5 |
HIP 17609 |
15.40 |
| 2026-09-29 00:00 |
03:46:23.26 |
+26:28:18.7 |
HIP 17609 |
15.37 |
| 2026-09-29 12:00 |
03:46:22.01 |
+26:28:17.9 |
HIP 17609 |
15.35 |
| 2026-09-30 00:00 |
03:46:20.74 |
+26:28:17.0 |
HIP 17609 |
15.33 |
| 2026-09-30 12:00 |
03:46:19.46 |
+26:28:16.1 |
HIP 17609 |
15.31 |
| 2026-10-01 00:00 |
03:46:18.16 |
+26:28:15.1 |
HIP 17609 |
15.30 |
| 2026-10-01 12:00 |
03:46:16.86 |
+26:28:14.1 |
HIP 17609 |
15.29 |
| 2026-10-02 00:00 |
03:46:15.54 |
+26:28:13.0 |
HIP 17609 |
15.29 |
| 2026-10-02 12:00 |
03:46:14.21 |
+26:28:11.9 |
HIP 17609 |
15.29 |
| 2026-10-03 00:00 |
03:46:12.86 |
+26:28:10.7 |
HIP 17609 |
15.30 |
| 2026-10-03 12:00 |
03:46:11.50 |
+26:28:09.4 |
HIP 17609 |
15.31 |
| 2026-10-04 00:00 |
03:46:10.13 |
+26:28:08.1 |
HIP 17609 |
15.33 |
| 2026-10-04 12:00 |
03:46:08.75 |
+26:28:06.8 |
HIP 17609 |
15.36 |
| 2026-10-05 00:00 |
03:46:07.36 |
+26:28:05.3 |
HIP 17609 |
15.39 |
| 2026-10-05 12:00 |
03:46:05.95 |
+26:28:03.9 |
HIP 17609 |
15.42 |
| 2026-10-06 00:00 |
03:46:04.53 |
+26:28:02.3 |
HIP 17609 |
15.47 |
| 2026-10-06 12:00 |
03:46:03.10 |
+26:28:00.8 |
HIP 17609 |
15.52 |
| 2026-10-07 00:00 |
03:46:01.66 |
+26:27:59.1 |
HIP 17609 |
15.57 |
| 2026-10-07 12:00 |
03:46:00.20 |
+26:27:57.4 |
HIP 17525 |
15.62 |
| 2026-10-08 00:00 |
03:45:58.74 |
+26:27:55.7 |
HIP 17525 |
15.35 |
| 2026-10-08 12:00 |
03:45:57.26 |
+26:27:53.9 |
HIP 17525 |
15.09 |
| 2026-10-09 00:00 |
03:45:55.77 |
+26:27:52.0 |
HIP 17525 |
14.83 |
| 2026-10-09 12:00 |
03:45:54.27 |
+26:27:50.1 |
HIP 17525 |
14.56 |
| 2026-10-10 00:00 |
03:45:52.76 |
+26:27:48.2 |
HIP 17525 |
14.30 |
| 2026-10-10 12:00 |
03:45:51.23 |
+26:27:46.2 |
HIP 17525 |
14.04 |
| 2026-10-11 00:00 |
03:45:49.70 |
+26:27:44.1 |
HIP 17525 |
13.78 |