C/2017 T3 (ATLAS)
メタデータ
| 項目 |
値 |
| Designation |
C/2017 T3 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-07-19T03:33:40.913280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:37Z |
| Obs used |
542 |
| NEO |
- |
| M1 |
11.100 |
| K1 |
7.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-12-26.0000000 |
| e |
0.99938609 |
| q (au) |
0.825222 |
| a (au) |
1344.198875 |
| i (deg) |
88.107202 |
| Ω (om, deg) |
230.086754 |
| ω (w, deg) |
246.893600 |
| M (ma, deg) |
359.995897 |
等級
散乱 + 全体線形
$$
M_a = (8.810 + 4.560\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.810 |
| n |
4.560 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
0.996 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2017-09-11 |
2018-01-19 |
-0.5909 |
+0.308 |
| 2018-01-19 |
2018-02-28 |
+1.5245 |
-0.600 |
| 2018-02-28 |
2018-03-31 |
-6.1200 |
+2.467 |
| 2018-03-31 |
2018-06-24 |
+5.8948 |
-1.097 |
| 2018-06-24 |
2018-07-18 |
-15.7469 |
-1.629 |
| 2018-07-19 |
2019-02-28 |
+4.6236 |
+0.173 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
16:14:10.29 |
+23:14:27.5 |
HIP 79412 |
25.13 |
| 2026-02-03 12:00 |
16:14:12.63 |
+23:15:24.7 |
HIP 79412 |
25.90 |
| 2026-02-04 00:00 |
16:14:14.91 |
+23:16:22.1 |
HIP 79412 |
26.69 |
| 2026-02-04 12:00 |
16:14:17.15 |
+23:17:19.9 |
HIP 79412 |
27.49 |
| 2026-02-05 00:00 |
16:14:19.34 |
+23:18:17.9 |
HIP 79412 |
28.30 |
| 2026-02-05 12:00 |
16:14:21.48 |
+23:19:16.3 |
HIP 79724 |
29.03 |
| 2026-02-06 00:00 |
16:14:23.57 |
+23:20:14.9 |
HIP 79724 |
29.01 |
| 2026-02-06 12:00 |
16:14:25.61 |
+23:21:13.8 |
HIP 79724 |
29.05 |
| 2026-02-07 00:00 |
16:14:27.60 |
+23:22:12.9 |
HIP 79724 |
29.14 |
| 2026-02-07 12:00 |
16:14:29.54 |
+23:23:12.4 |
HIP 79724 |
29.28 |
| 2026-02-08 00:00 |
16:14:31.43 |
+23:24:12.1 |
HIP 79724 |
29.47 |
| 2026-02-08 12:00 |
16:14:33.28 |
+23:25:12.0 |
HIP 79724 |
29.71 |
| 2026-02-09 00:00 |
16:14:35.07 |
+23:26:12.3 |
HIP 79724 |
30.00 |
| 2026-02-09 12:00 |
16:14:36.81 |
+23:27:12.8 |
HIP 79724 |
30.34 |
| 2026-02-10 00:00 |
16:14:38.50 |
+23:28:13.5 |
HIP 79724 |
30.72 |
| 2026-02-10 12:00 |
16:14:40.14 |
+23:29:14.5 |
HIP 79724 |
31.15 |
| 2026-02-11 00:00 |
16:14:41.72 |
+23:30:15.7 |
HIP 79724 |
31.62 |
| 2026-02-11 12:00 |
16:14:43.26 |
+23:31:17.2 |
HIP 79724 |
32.13 |
| 2026-02-12 00:00 |
16:14:44.75 |
+23:32:18.9 |
HIP 79724 |
32.69 |
| 2026-02-12 12:00 |
16:14:46.18 |
+23:33:20.8 |
HIP 79724 |
33.27 |
| 2026-02-13 00:00 |
16:14:47.56 |
+23:34:23.0 |
HIP 79724 |
33.89 |
| 2026-02-13 12:00 |
16:14:48.89 |
+23:35:25.4 |
HIP 79724 |
34.55 |
| 2026-02-14 00:00 |
16:14:50.17 |
+23:36:28.0 |
HIP 79724 |
35.23 |
| 2026-02-14 12:00 |
16:14:51.40 |
+23:37:30.8 |
HIP 79724 |
35.95 |
| 2026-02-15 00:00 |
16:14:52.57 |
+23:38:33.8 |
HIP 79724 |
36.69 |
| 2026-02-15 12:00 |
16:14:53.69 |
+23:39:37.0 |
HIP 79724 |
37.46 |
| 2026-02-16 00:00 |
16:14:54.76 |
+23:40:40.5 |
HIP 79724 |
38.25 |
| 2026-02-16 12:00 |
16:14:55.78 |
+23:41:44.1 |
HIP 79724 |
39.07 |
| 2026-02-17 00:00 |
16:14:56.74 |
+23:42:47.9 |
HIP 79724 |
39.90 |
| 2026-02-17 12:00 |
16:14:57.65 |
+23:43:51.9 |
HIP 79846 |
40.50 |
| 2026-02-18 00:00 |
16:14:58.50 |
+23:44:56.1 |
HIP 79846 |
40.52 |
| 2026-02-18 12:00 |
16:14:59.31 |
+23:46:00.5 |
HIP 79846 |
40.58 |
| 2026-02-19 00:00 |
16:15:00.06 |
+23:47:05.0 |
HIP 79846 |
40.67 |
| 2026-02-19 12:00 |
16:15:00.76 |
+23:48:09.7 |
HIP 79846 |
40.81 |
| 2026-02-20 00:00 |
16:15:01.40 |
+23:49:14.6 |
HIP 79846 |
41.00 |
| 2026-02-20 12:00 |
16:15:01.99 |
+23:50:19.6 |
HIP 79846 |
41.22 |
| 2026-02-21 00:00 |
16:15:02.52 |
+23:51:24.8 |
HIP 79639 |
40.21 |
| 2026-02-21 12:00 |
16:15:03.01 |
+23:52:30.1 |
HIP 79639 |
39.12 |
| 2026-02-22 00:00 |
16:15:03.44 |
+23:53:35.6 |
HIP 79639 |
38.03 |
| 2026-02-22 12:00 |
16:15:03.81 |
+23:54:41.2 |
HIP 79639 |
36.93 |
| 2026-02-23 00:00 |
16:15:04.13 |
+23:55:46.9 |
HIP 79639 |
35.83 |
| 2026-02-23 12:00 |
16:15:04.40 |
+23:56:52.8 |
HIP 79639 |
34.74 |
| 2026-02-24 00:00 |
16:15:04.61 |
+23:57:58.8 |
HIP 79639 |
33.64 |