メタデータ
| 項目 |
値 |
| Designation |
C/2015 X7 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-07-30T05:59:33.682560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:20Z |
| Obs used |
620 |
| NEO |
- |
| M1 |
11.600 |
| K1 |
6.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2016-09-22.0000000 |
| e |
1.00189036 |
| q (au) |
3.684550 |
| a (au) |
-1949.127032 |
| i (deg) |
57.578925 |
| Ω (om, deg) |
139.884070 |
| ω (w, deg) |
348.488537 |
| M (ma, deg) |
0.000616 |
等級
散乱 + 全体線形
$$
M_a = (11.078 + 2.092\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.078 |
| n |
2.092 |
| gf |
1.000 |
| gb |
-0.998 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2015-01-28 |
2016-05-01 |
-0.2726 |
-0.309 |
| 2016-11-02 |
2017-06-16 |
-0.5340 |
+0.555 |
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) |
| 2026-05-12 00:00 |
18:31:40.21 |
+24:34:39.7 |
HIP 90919 |
16.53 |
| 2026-05-12 12:00 |
18:31:36.76 |
+24:35:14.4 |
HIP 90919 |
17.07 |
| 2026-05-13 00:00 |
18:31:33.26 |
+24:35:48.7 |
HIP 90919 |
17.65 |
| 2026-05-13 12:00 |
18:31:29.73 |
+24:36:22.6 |
HIP 90919 |
18.28 |
| 2026-05-14 00:00 |
18:31:26.17 |
+24:36:56.2 |
HIP 90919 |
18.95 |
| 2026-05-14 12:00 |
18:31:22.57 |
+24:37:29.4 |
HIP 90919 |
19.65 |
| 2026-05-15 00:00 |
18:31:18.93 |
+24:38:02.2 |
HIP 90919 |
20.39 |
| 2026-05-15 12:00 |
18:31:15.25 |
+24:38:34.7 |
HIP 90919 |
21.15 |
| 2026-05-16 00:00 |
18:31:11.55 |
+24:39:06.7 |
HIP 90919 |
21.94 |
| 2026-05-16 12:00 |
18:31:07.80 |
+24:39:38.4 |
HIP 90919 |
22.76 |
| 2026-05-17 00:00 |
18:31:04.03 |
+24:40:09.6 |
HIP 90919 |
23.59 |
| 2026-05-17 12:00 |
18:31:00.22 |
+24:40:40.5 |
HIP 90919 |
24.45 |
| 2026-05-18 00:00 |
18:30:56.37 |
+24:41:11.0 |
HIP 90919 |
25.33 |
| 2026-05-18 12:00 |
18:30:52.49 |
+24:41:41.1 |
HIP 90919 |
26.22 |
| 2026-05-19 00:00 |
18:30:48.58 |
+24:42:10.7 |
HIP 90919 |
27.13 |
| 2026-05-19 12:00 |
18:30:44.64 |
+24:42:40.0 |
HIP 90770 |
27.72 |
| 2026-05-20 00:00 |
18:30:40.66 |
+24:43:08.8 |
HIP 90770 |
27.45 |
| 2026-05-20 12:00 |
18:30:36.66 |
+24:43:37.3 |
HIP 90770 |
27.22 |
| 2026-05-21 00:00 |
18:30:32.62 |
+24:44:05.3 |
HIP 90770 |
27.04 |
| 2026-05-21 12:00 |
18:30:28.55 |
+24:44:32.9 |
HIP 90770 |
26.91 |
| 2026-05-22 00:00 |
18:30:24.45 |
+24:45:00.1 |
HIP 90699 |
26.50 |
| 2026-05-22 12:00 |
18:30:20.32 |
+24:45:26.9 |
HIP 90699 |
26.02 |
| 2026-05-23 00:00 |
18:30:16.16 |
+24:45:53.2 |
HIP 90699 |
25.57 |
| 2026-05-23 12:00 |
18:30:11.97 |
+24:46:19.1 |
HIP 90699 |
25.17 |
| 2026-05-24 00:00 |
18:30:07.75 |
+24:46:44.6 |
HIP 90699 |
24.81 |
| 2026-05-24 12:00 |
18:30:03.50 |
+24:47:09.6 |
HIP 90699 |
24.50 |
| 2026-05-25 00:00 |
18:29:59.23 |
+24:47:34.2 |
HIP 90699 |
24.24 |
| 2026-05-25 12:00 |
18:29:54.93 |
+24:47:58.4 |
HIP 90699 |
24.03 |
| 2026-05-26 00:00 |
18:29:50.60 |
+24:48:22.1 |
HIP 90699 |
23.87 |
| 2026-05-26 12:00 |
18:29:46.24 |
+24:48:45.4 |
HIP 90699 |
23.77 |
| 2026-05-27 00:00 |
18:29:41.86 |
+24:49:08.3 |
HIP 90699 |
23.73 |
| 2026-05-27 12:00 |
18:29:37.45 |
+24:49:30.7 |
HIP 90699 |
23.74 |
| 2026-05-28 00:00 |
18:29:33.01 |
+24:49:52.6 |
HIP 90699 |
23.81 |
| 2026-05-28 12:00 |
18:29:28.55 |
+24:50:14.2 |
HIP 90699 |
23.94 |
| 2026-05-29 00:00 |
18:29:24.06 |
+24:50:35.2 |
HIP 90483 |
23.94 |
| 2026-05-29 12:00 |
18:29:19.55 |
+24:50:55.8 |
HIP 90483 |
23.12 |
| 2026-05-30 00:00 |
18:29:15.01 |
+24:51:16.0 |
HIP 90483 |
22.32 |
| 2026-05-30 12:00 |
18:29:10.45 |
+24:51:35.7 |
HIP 90483 |
21.53 |
| 2026-05-31 00:00 |
18:29:05.87 |
+24:51:54.9 |
HIP 90483 |
20.76 |
| 2026-05-31 12:00 |
18:29:01.26 |
+24:52:13.7 |
HIP 90483 |
20.01 |
| 2026-06-01 00:00 |
18:28:56.63 |
+24:52:32.0 |
HIP 90483 |
19.29 |
| 2026-06-01 12:00 |
18:28:51.98 |
+24:52:49.9 |
HIP 90483 |
18.59 |
| 2026-06-02 00:00 |
18:28:47.31 |
+24:53:07.3 |
HIP 90483 |
17.93 |