메타데이터
| 항목 |
값 |
| Designation |
C/2015 X8 (NEOWISE) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-10-23T02:58:51.087360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:20Z |
| Obs used |
116 |
| NEO |
Yes |
| M1 |
16.200 |
| K1 |
4.500 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2016-01-22.0000000 |
| e |
0.93911400 |
| q (au) |
1.190273 |
| a (au) |
19.549200 |
| i (deg) |
155.281698 |
| Ω (om, deg) |
191.111870 |
| ω (w, deg) |
20.400527 |
| M (ma, deg) |
1.036236 |
밝기
산란 + 전체 선형
$$
M_a = (15.395 + 4.524\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
15.395 |
| n |
4.524 |
| gf |
0.999 |
| gb |
-0.984 |
| k |
0.971 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-25 00:00 |
00:34:01.25 |
+02:11:16.9 |
HIP 2680 |
10.41 |
| 2026-09-25 12:00 |
00:33:55.93 |
+02:10:40.0 |
HIP 2680 |
9.77 |
| 2026-09-26 00:00 |
00:33:50.61 |
+02:10:03.1 |
HIP 2680 |
9.31 |
| 2026-09-26 12:00 |
00:33:45.28 |
+02:09:26.2 |
HIP 2680 |
9.07 |
| 2026-09-27 00:00 |
00:33:39.95 |
+02:08:49.3 |
HIP 2680 |
9.07 |
| 2026-09-27 12:00 |
00:33:34.62 |
+02:08:12.3 |
HIP 2680 |
9.30 |
| 2026-09-28 00:00 |
00:33:29.28 |
+02:07:35.4 |
HIP 2680 |
9.75 |
| 2026-09-28 12:00 |
00:33:23.94 |
+02:06:58.5 |
HIP 2680 |
10.39 |
| 2026-09-29 00:00 |
00:33:18.60 |
+02:06:21.5 |
HIP 2680 |
11.18 |
| 2026-09-29 12:00 |
00:33:13.25 |
+02:05:44.6 |
HIP 2680 |
12.11 |
| 2026-09-30 00:00 |
00:33:07.91 |
+02:05:07.7 |
HIP 2680 |
13.13 |
| 2026-09-30 12:00 |
00:33:02.56 |
+02:04:30.7 |
HIP 2680 |
14.24 |
| 2026-10-01 00:00 |
00:32:57.21 |
+02:03:53.8 |
HIP 2680 |
15.40 |
| 2026-10-01 12:00 |
00:32:51.86 |
+02:03:16.9 |
HIP 2680 |
16.62 |
| 2026-10-02 00:00 |
00:32:46.51 |
+02:02:40.1 |
HIP 2680 |
17.87 |
| 2026-10-02 12:00 |
00:32:41.16 |
+02:02:03.2 |
HIP 2680 |
19.15 |
| 2026-10-03 00:00 |
00:32:35.81 |
+02:01:26.4 |
HIP 2458 |
20.44 |
| 2026-10-03 12:00 |
00:32:30.47 |
+02:00:49.6 |
HIP 2458 |
19.03 |
| 2026-10-04 00:00 |
00:32:25.12 |
+02:00:12.8 |
HIP 2458 |
17.62 |
| 2026-10-04 12:00 |
00:32:19.78 |
+01:59:36.0 |
HIP 2458 |
16.22 |
| 2026-10-05 00:00 |
00:32:14.44 |
+01:58:59.3 |
HIP 2458 |
14.83 |
| 2026-10-05 12:00 |
00:32:09.10 |
+01:58:22.6 |
HIP 2458 |
13.47 |
| 2026-10-06 00:00 |
00:32:03.76 |
+01:57:46.0 |
HIP 2458 |
12.13 |
| 2026-10-06 12:00 |
00:31:58.43 |
+01:57:09.4 |
HIP 2458 |
10.82 |
| 2026-10-07 00:00 |
00:31:53.11 |
+01:56:32.8 |
HIP 2458 |
9.56 |
| 2026-10-07 12:00 |
00:31:47.78 |
+01:55:56.3 |
HIP 2458 |
8.36 |
| 2026-10-08 00:00 |
00:31:42.47 |
+01:55:19.9 |
HIP 2458 |
7.27 |
| 2026-10-08 12:00 |
00:31:37.16 |
+01:54:43.4 |
HIP 2458 |
6.33 |
| 2026-10-09 00:00 |
00:31:31.85 |
+01:54:07.1 |
HIP 2458 |
5.61 |
| 2026-10-09 12:00 |
00:31:26.55 |
+01:53:30.8 |
HIP 2458 |
5.21 |
| 2026-10-10 00:00 |
00:31:21.26 |
+01:52:54.6 |
HIP 2458 |
5.20 |
| 2026-10-10 12:00 |
00:31:15.98 |
+01:52:18.4 |
HIP 2458 |
5.58 |
| 2026-10-11 00:00 |
00:31:10.70 |
+01:51:42.4 |
HIP 2458 |
6.28 |
| 2026-10-11 12:00 |
00:31:05.44 |
+01:51:06.3 |
HIP 2458 |
7.21 |
| 2026-10-12 00:00 |
00:31:00.18 |
+01:50:30.4 |
HIP 2458 |
8.28 |
| 2026-10-12 12:00 |
00:30:54.93 |
+01:49:54.5 |
HIP 2458 |
9.45 |
| 2026-10-13 00:00 |
00:30:49.69 |
+01:49:18.8 |
HIP 2458 |
10.69 |
| 2026-10-13 12:00 |
00:30:44.46 |
+01:48:43.1 |
HIP 2458 |
11.97 |
| 2026-10-14 00:00 |
00:30:39.24 |
+01:48:07.4 |
HIP 2458 |
13.27 |
| 2026-10-14 12:00 |
00:30:34.03 |
+01:47:31.9 |
HIP 2458 |
14.60 |
| 2026-10-15 00:00 |
00:30:28.84 |
+01:46:56.5 |
HIP 2458 |
15.94 |
| 2026-10-15 12:00 |
00:30:23.65 |
+01:46:21.2 |
HIP 2458 |
17.29 |
| 2026-10-16 00:00 |
00:30:18.48 |
+01:45:45.9 |
HIP 2458 |
18.65 |