메타데이터
| 항목 |
값 |
| Designation |
361P/Spacewatch |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-07-02T14:46:57.017280Z |
| Orbit solution date (soln_date, UTC) |
2023-02-13T23:14:08Z |
| Obs used |
381 |
| NEO |
- |
| M1 |
4.600 |
| K1 |
23.500 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2017-09-16.0000000 |
| e |
0.43788752 |
| q (au) |
2.780030 |
| a (au) |
4.945682 |
| i (deg) |
13.882834 |
| Ω (om, deg) |
203.277939 |
| ω (w, deg) |
219.242791 |
| M (ma, deg) |
334.047022 |
밝기
산란 + 전체 선형
$$
M_a = (7.723 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
7.723 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2017-09-11 |
2018-01-27 |
+17.2864 |
-8.358 |
| 2018-08-25 |
2020-03-21 |
+2.3797 |
-1.430 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
18:34:54.80 |
-06:57:58.8 |
HIP 90976 |
21.97 |
| 2026-07-29 12:00 |
18:34:41.92 |
-06:58:45.4 |
HIP 90976 |
19.01 |
| 2026-07-30 00:00 |
18:34:29.13 |
-06:59:32.6 |
HIP 90976 |
16.22 |
| 2026-07-30 12:00 |
18:34:16.45 |
-07:00:20.5 |
HIP 90976 |
13.66 |
| 2026-07-31 00:00 |
18:34:03.88 |
-07:01:08.8 |
HIP 90976 |
11.48 |
| 2026-07-31 12:00 |
18:33:51.41 |
-07:01:57.7 |
HIP 90976 |
9.91 |
| 2026-08-01 00:00 |
18:33:39.06 |
-07:02:47.2 |
HIP 90976 |
9.24 |
| 2026-08-01 12:00 |
18:33:26.81 |
-07:03:37.2 |
HIP 90976 |
9.64 |
| 2026-08-02 00:00 |
18:33:14.68 |
-07:04:27.7 |
HIP 90976 |
10.97 |
| 2026-08-02 12:00 |
18:33:02.66 |
-07:05:18.8 |
HIP 90976 |
12.93 |
| 2026-08-03 00:00 |
18:32:50.76 |
-07:06:10.4 |
HIP 90976 |
15.26 |
| 2026-08-03 12:00 |
18:32:38.97 |
-07:07:02.5 |
HIP 90976 |
17.81 |
| 2026-08-04 00:00 |
18:32:27.30 |
-07:07:55.1 |
HIP 90976 |
20.48 |
| 2026-08-04 12:00 |
18:32:15.75 |
-07:08:48.3 |
HIP 90976 |
23.22 |
| 2026-08-05 00:00 |
18:32:04.33 |
-07:09:41.9 |
HIP 90976 |
25.99 |
| 2026-08-05 12:00 |
18:31:53.03 |
-07:10:36.0 |
HIP 90976 |
28.79 |
| 2026-08-06 00:00 |
18:31:41.85 |
-07:11:30.6 |
HIP 90652 |
28.10 |
| 2026-08-06 12:00 |
18:31:30.80 |
-07:12:25.7 |
HIP 90652 |
25.24 |
| 2026-08-07 00:00 |
18:31:19.88 |
-07:13:21.3 |
HIP 90652 |
22.40 |
| 2026-08-07 12:00 |
18:31:09.08 |
-07:14:17.3 |
HIP 90652 |
19.61 |
| 2026-08-08 00:00 |
18:30:58.42 |
-07:15:13.8 |
HIP 90652 |
16.86 |
| 2026-08-08 12:00 |
18:30:47.89 |
-07:16:10.7 |
HIP 90652 |
14.17 |
| 2026-08-09 00:00 |
18:30:37.50 |
-07:17:08.1 |
HIP 90652 |
11.55 |
| 2026-08-09 12:00 |
18:30:27.24 |
-07:18:05.9 |
HIP 90652 |
9.05 |
| 2026-08-10 00:00 |
18:30:17.12 |
-07:19:04.2 |
HIP 90652 |
6.75 |
| 2026-08-10 12:00 |
18:30:07.13 |
-07:20:02.8 |
HIP 90652 |
4.90 |
| 2026-08-11 00:00 |
18:29:57.29 |
-07:21:01.9 |
HIP 90652 |
4.11 |
| 2026-08-11 12:00 |
18:29:47.59 |
-07:22:01.4 |
HIP 90652 |
4.85 |
| 2026-08-12 00:00 |
18:29:38.03 |
-07:23:01.3 |
HIP 90652 |
6.60 |
| 2026-08-12 12:00 |
18:29:28.61 |
-07:24:01.6 |
HIP 90652 |
8.75 |
| 2026-08-13 00:00 |
18:29:19.34 |
-07:25:02.3 |
HIP 90652 |
11.05 |
| 2026-08-13 12:00 |
18:29:10.22 |
-07:26:03.3 |
HIP 90652 |
13.40 |
| 2026-08-14 00:00 |
18:29:01.25 |
-07:27:04.7 |
HIP 90652 |
15.76 |
| 2026-08-14 12:00 |
18:28:52.42 |
-07:28:06.5 |
HIP 90652 |
18.12 |
| 2026-08-15 00:00 |
18:28:43.75 |
-07:29:08.6 |
HIP 90652 |
20.47 |
| 2026-08-15 12:00 |
18:28:35.22 |
-07:30:11.0 |
HIP 90652 |
22.79 |
| 2026-08-16 00:00 |
18:28:26.85 |
-07:31:13.8 |
HIP 90652 |
25.10 |
| 2026-08-16 12:00 |
18:28:18.63 |
-07:32:16.9 |
HIP 90652 |
27.38 |
| 2026-08-17 00:00 |
18:28:10.57 |
-07:33:20.3 |
HIP 90652 |
29.63 |
| 2026-08-17 12:00 |
18:28:02.66 |
-07:34:24.1 |
HIP 90437 |
31.03 |
| 2026-08-18 00:00 |
18:27:54.91 |
-07:35:28.1 |
HIP 90437 |
29.27 |
| 2026-08-18 12:00 |
18:27:47.32 |
-07:36:32.4 |
HIP 90437 |
27.58 |
| 2026-08-19 00:00 |
18:27:39.88 |
-07:37:37.0 |
HIP 90437 |
25.97 |