메타데이터
| 항목 |
값 |
| Designation |
417P/NEOWISE |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-04-21T21:50:27.404160Z |
| Orbit solution date (soln_date, UTC) |
2025-04-09T14:06:24Z |
| Obs used |
277 |
| NEO |
- |
| M1 |
17.500 |
| K1 |
6.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-01-17T05:24:50.284800Z |
| Discovery magnitude (MPC) |
20.40 T |
| Discovery observatory (MPC) |
Z84 · Calar Alto-Schmidt |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2019-01-27.0000000 |
| e |
0.55459375 |
| q (au) |
1.492286 |
| a (au) |
3.350393 |
| i (deg) |
8.129115 |
| Ω (om, deg) |
111.357188 |
| ω (w, deg) |
129.397423 |
| M (ma, deg) |
228.869825 |
밝기
산란 + 전체 선형
$$
M_a = (17.824 + 3.206\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
17.824 |
| n |
3.206 |
| gf |
0.800 |
| gb |
-0.673 |
| k |
0.914 |
| δ90 |
1.000 |
| 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
찾아보기
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
10:06:19.57 |
+17:47:52.9 |
HIP 49522 |
7.72 |
| 2026-09-20 12:00 |
10:07:10.64 |
+17:44:20.7 |
HIP 49622 |
6.38 |
| 2026-09-21 00:00 |
10:08:01.74 |
+17:40:48.1 |
HIP 49622 |
6.71 |
| 2026-09-21 12:00 |
10:08:52.87 |
+17:37:14.9 |
HIP 49657 |
18.15 |
| 2026-09-22 00:00 |
10:09:44.02 |
+17:33:41.2 |
HIP 49657 |
24.50 |
| 2026-09-22 12:00 |
10:10:35.20 |
+17:30:06.9 |
HIP 49939 |
22.03 |
| 2026-09-23 00:00 |
10:11:26.41 |
+17:26:32.2 |
HIP 49939 |
11.25 |
| 2026-09-23 12:00 |
10:12:17.64 |
+17:22:56.9 |
HIP 49988 |
4.98 |
| 2026-09-24 00:00 |
10:13:08.89 |
+17:19:21.1 |
HIP 49988 |
11.95 |
| 2026-09-24 12:00 |
10:14:00.18 |
+17:15:44.8 |
HIP 50053 |
18.91 |
| 2026-09-25 00:00 |
10:14:51.48 |
+17:12:07.9 |
HIP 50229 |
21.16 |
| 2026-09-25 12:00 |
10:15:42.82 |
+17:08:30.6 |
HIP 50229 |
18.40 |
| 2026-09-26 00:00 |
10:16:34.18 |
+17:04:52.8 |
HIP 50445 |
21.44 |
| 2026-09-26 12:00 |
10:17:25.57 |
+17:01:14.5 |
HIP 50445 |
12.90 |
| 2026-09-27 00:00 |
10:18:16.98 |
+16:57:35.7 |
HIP 50445 |
14.20 |
| 2026-09-27 12:00 |
10:19:08.42 |
+16:53:56.4 |
HIP 50549 |
6.00 |
| 2026-09-28 00:00 |
10:19:59.89 |
+16:50:16.6 |
HIP 50549 |
10.09 |
| 2026-09-28 12:00 |
10:20:51.38 |
+16:46:36.3 |
HIP 50549 |
22.32 |
| 2026-09-29 00:00 |
10:21:42.90 |
+16:42:55.6 |
HIP 50819 |
12.54 |
| 2026-09-29 12:00 |
10:22:34.45 |
+16:39:14.4 |
HIP 50819 |
5.24 |
| 2026-09-30 00:00 |
10:23:26.03 |
+16:35:32.7 |
HIP 50819 |
15.17 |
| 2026-09-30 12:00 |
10:24:17.63 |
+16:31:50.6 |
HIP 50819 |
27.67 |
| 2026-10-01 00:00 |
10:25:09.26 |
+16:28:08.0 |
HIP 51020 |
27.29 |
| 2026-10-01 12:00 |
10:26:00.92 |
+16:24:24.9 |
HIP 51221 |
24.83 |
| 2026-10-02 00:00 |
10:26:52.60 |
+16:20:41.5 |
HIP 51221 |
12.22 |
| 2026-10-02 12:00 |
10:27:44.31 |
+16:16:57.5 |
HIP 51221 |
4.14 |
| 2026-10-03 00:00 |
10:28:36.05 |
+16:13:13.2 |
HIP 51221 |
14.86 |
| 2026-10-03 12:00 |
10:29:27.82 |
+16:09:28.4 |
HIP 51479 |
25.68 |
| 2026-10-04 00:00 |
10:30:19.61 |
+16:05:43.1 |
HIP 51479 |
14.07 |
| 2026-10-04 12:00 |
10:31:11.43 |
+16:01:57.5 |
HIP 51479 |
8.62 |
| 2026-10-05 00:00 |
10:32:03.28 |
+15:58:11.5 |
HIP 51479 |
17.01 |
| 2026-10-05 12:00 |
10:32:55.15 |
+15:54:25.0 |
HIP 51479 |
29.05 |
| 2026-10-06 00:00 |
10:33:47.06 |
+15:50:38.2 |
HIP 51897 |
34.61 |
| 2026-10-06 12:00 |
10:34:38.98 |
+15:46:51.0 |
HIP 51897 |
22.76 |
| 2026-10-07 00:00 |
10:35:30.93 |
+15:43:03.4 |
HIP 51897 |
13.35 |
| 2026-10-07 12:00 |
10:36:22.91 |
+15:39:15.4 |
HIP 51897 |
13.41 |
| 2026-10-08 00:00 |
10:37:14.92 |
+15:35:27.1 |
HIP 51897 |
22.88 |
| 2026-10-08 12:00 |
10:38:06.95 |
+15:31:38.4 |
HIP 51959 |
27.23 |
| 2026-10-09 00:00 |
10:38:59.00 |
+15:27:49.3 |
HIP 52126 |
31.17 |
| 2026-10-09 12:00 |
10:39:51.08 |
+15:24:00.0 |
HIP 52242 |
27.46 |
| 2026-10-10 00:00 |
10:40:43.19 |
+15:20:10.2 |
HIP 52242 |
22.78 |
| 2026-10-10 12:00 |
10:41:35.32 |
+15:16:20.1 |
HIP 52242 |
25.08 |
| 2026-10-11 00:00 |
10:42:27.48 |
+15:12:29.7 |
HIP 52446 |
18.46 |