C/2015 XY1 (Lemmon)
메타데이터
| 항목 |
값 |
| Designation |
C/2015 XY1 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-04-29T23:09:25.130880Z |
| Orbit solution date (soln_date, UTC) |
2022-07-31T01:42:27Z |
| Obs used |
741 |
| NEO |
- |
| M1 |
6.400 |
| K1 |
8.250 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2018-03-20.0000000 |
| e |
1.00401907 |
| q (au) |
7.927954 |
| a (au) |
-1972.582314 |
| i (deg) |
148.846771 |
| Ω (om, deg) |
281.616004 |
| ω (w, deg) |
196.354336 |
| M (ma, deg) |
-0.000461 |
밝기
산란 + 전체 선형
$$
M_a = (-0.857 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
-0.857 |
| n |
6.000 |
| gf |
0.882 |
| gb |
-0.939 |
| k |
1.000 |
| δ90 |
3.911 |
| 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) |
| 2026-02-03 00:00 |
23:51:40.21 |
-31:04:36.4 |
HIP 117686 |
18.48 |
| 2026-02-03 12:00 |
23:51:43.65 |
-31:03:42.9 |
HIP 117686 |
19.19 |
| 2026-02-04 00:00 |
23:51:47.12 |
-31:02:49.6 |
HIP 117686 |
19.94 |
| 2026-02-04 12:00 |
23:51:50.63 |
-31:01:56.3 |
HIP 117686 |
20.72 |
| 2026-02-05 00:00 |
23:51:54.18 |
-31:01:03.3 |
HIP 117686 |
21.54 |
| 2026-02-05 12:00 |
23:51:57.77 |
-31:00:10.3 |
HIP 117686 |
22.38 |
| 2026-02-06 00:00 |
23:52:01.40 |
-30:59:17.6 |
HIP 117686 |
23.25 |
| 2026-02-06 12:00 |
23:52:05.06 |
-30:58:24.9 |
HIP 117686 |
24.14 |
| 2026-02-07 00:00 |
23:52:08.75 |
-30:57:32.5 |
HIP 117686 |
25.06 |
| 2026-02-07 12:00 |
23:52:12.49 |
-30:56:40.2 |
HIP 117686 |
25.99 |
| 2026-02-08 00:00 |
23:52:16.26 |
-30:55:48.1 |
HIP 117686 |
26.94 |
| 2026-02-08 12:00 |
23:52:20.06 |
-30:54:56.1 |
HIP 117862 |
26.78 |
| 2026-02-09 00:00 |
23:52:23.90 |
-30:54:04.3 |
HIP 117862 |
26.17 |
| 2026-02-09 12:00 |
23:52:27.77 |
-30:53:12.7 |
HIP 117862 |
25.60 |
| 2026-02-10 00:00 |
23:52:31.68 |
-30:52:21.3 |
HIP 117862 |
25.06 |
| 2026-02-10 12:00 |
23:52:35.62 |
-30:51:30.1 |
HIP 117862 |
24.55 |
| 2026-02-11 00:00 |
23:52:39.59 |
-30:50:39.0 |
HIP 117862 |
24.09 |
| 2026-02-11 12:00 |
23:52:43.60 |
-30:49:48.1 |
HIP 117862 |
23.68 |
| 2026-02-12 00:00 |
23:52:47.63 |
-30:48:57.5 |
HIP 117862 |
23.31 |
| 2026-02-12 12:00 |
23:52:51.70 |
-30:48:07.0 |
HIP 117862 |
22.99 |
| 2026-02-13 00:00 |
23:52:55.80 |
-30:47:16.7 |
HIP 117862 |
22.72 |
| 2026-02-13 12:00 |
23:52:59.94 |
-30:46:26.7 |
HIP 117862 |
22.51 |
| 2026-02-14 00:00 |
23:53:04.10 |
-30:45:36.8 |
HIP 117862 |
22.35 |
| 2026-02-14 12:00 |
23:53:08.29 |
-30:44:47.2 |
HIP 117862 |
22.26 |
| 2026-02-15 00:00 |
23:53:12.51 |
-30:43:57.8 |
HIP 117862 |
22.22 |
| 2026-02-15 12:00 |
23:53:16.76 |
-30:43:08.6 |
HIP 117862 |
22.24 |
| 2026-02-16 00:00 |
23:53:21.04 |
-30:42:19.6 |
HIP 117840 |
22.31 |
| 2026-02-16 12:00 |
23:53:25.35 |
-30:41:30.8 |
HIP 117840 |
21.23 |
| 2026-02-17 00:00 |
23:53:29.68 |
-30:40:42.3 |
HIP 117840 |
20.18 |
| 2026-02-17 12:00 |
23:53:34.04 |
-30:39:54.0 |
HIP 117840 |
19.14 |
| 2026-02-18 00:00 |
23:53:38.43 |
-30:39:06.0 |
HIP 117840 |
18.14 |
| 2026-02-18 12:00 |
23:53:42.85 |
-30:38:18.2 |
HIP 117840 |
17.17 |
| 2026-02-19 00:00 |
23:53:47.29 |
-30:37:30.6 |
HIP 117840 |
16.23 |
| 2026-02-19 12:00 |
23:53:51.75 |
-30:36:43.3 |
HIP 117840 |
15.35 |
| 2026-02-20 00:00 |
23:53:56.24 |
-30:35:56.3 |
HIP 117840 |
14.52 |
| 2026-02-20 12:00 |
23:54:00.76 |
-30:35:09.5 |
HIP 117840 |
13.76 |
| 2026-02-21 00:00 |
23:54:05.30 |
-30:34:22.9 |
HIP 117840 |
13.08 |
| 2026-02-21 12:00 |
23:54:09.86 |
-30:33:36.6 |
HIP 117840 |
12.50 |
| 2026-02-22 00:00 |
23:54:14.45 |
-30:32:50.6 |
HIP 117840 |
12.02 |
| 2026-02-22 12:00 |
23:54:19.05 |
-30:32:04.9 |
HIP 117840 |
11.66 |
| 2026-02-23 00:00 |
23:54:23.68 |
-30:31:19.4 |
HIP 117840 |
11.43 |
| 2026-02-23 12:00 |
23:54:28.33 |
-30:30:34.2 |
HIP 117840 |
11.35 |
| 2026-02-24 00:00 |
23:54:33.01 |
-30:29:49.2 |
HIP 117840 |
11.41 |