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
$$
M_a = (-0.855 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
-0.855 |
| n |
6.000 |
| gf |
0.882 |
| gb |
-0.939 |
| k |
1.000 |
| δ90 |
3.868 |
| 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) |
| 2026-09-20 00:00 |
23:48:39.63 |
-33:46:08.9 |
HIP 117598 |
31.03 |
| 2026-09-20 12:00 |
23:48:30.59 |
-33:46:45.4 |
HIP 117372 |
32.55 |
| 2026-09-21 00:00 |
23:48:21.54 |
-33:47:21.5 |
HIP 117372 |
31.60 |
| 2026-09-21 12:00 |
23:48:12.50 |
-33:47:57.0 |
HIP 117372 |
30.75 |
| 2026-09-22 00:00 |
23:48:03.47 |
-33:48:32.0 |
HIP 117372 |
30.02 |
| 2026-09-22 12:00 |
23:47:54.44 |
-33:49:06.5 |
HIP 117372 |
29.41 |
| 2026-09-23 00:00 |
23:47:45.41 |
-33:49:40.4 |
HIP 117372 |
28.92 |
| 2026-09-23 12:00 |
23:47:36.39 |
-33:50:13.8 |
HIP 117372 |
28.57 |
| 2026-09-24 00:00 |
23:47:27.38 |
-33:50:46.7 |
HIP 117372 |
28.36 |
| 2026-09-24 12:00 |
23:47:18.37 |
-33:51:19.0 |
HIP 117372 |
28.29 |
| 2026-09-25 00:00 |
23:47:09.37 |
-33:51:50.8 |
HIP 117372 |
28.37 |
| 2026-09-25 12:00 |
23:47:00.38 |
-33:52:22.1 |
HIP 117372 |
28.58 |
| 2026-09-26 00:00 |
23:46:51.41 |
-33:52:52.8 |
HIP 117372 |
28.92 |
| 2026-09-26 12:00 |
23:46:42.44 |
-33:53:23.0 |
HIP 117372 |
29.39 |
| 2026-09-27 00:00 |
23:46:33.48 |
-33:53:52.6 |
HIP 117372 |
29.99 |
| 2026-09-27 12:00 |
23:46:24.53 |
-33:54:21.7 |
HIP 117372 |
30.70 |
| 2026-09-28 00:00 |
23:46:15.59 |
-33:54:50.2 |
HIP 117372 |
31.52 |
| 2026-09-28 12:00 |
23:46:06.67 |
-33:55:18.2 |
HIP 117372 |
32.43 |
| 2026-09-29 00:00 |
23:45:57.76 |
-33:55:45.7 |
HIP 117372 |
33.43 |
| 2026-09-29 12:00 |
23:45:48.86 |
-33:56:12.6 |
HIP 117372 |
34.51 |
| 2026-09-30 00:00 |
23:45:39.98 |
-33:56:38.9 |
HIP 117100 |
34.37 |
| 2026-09-30 12:00 |
23:45:31.11 |
-33:57:04.7 |
HIP 117100 |
33.16 |
| 2026-10-01 00:00 |
23:45:22.26 |
-33:57:29.9 |
HIP 117100 |
32.03 |
| 2026-10-01 12:00 |
23:45:13.42 |
-33:57:54.6 |
HIP 117100 |
30.98 |
| 2026-10-02 00:00 |
23:45:04.60 |
-33:58:18.7 |
HIP 117100 |
30.01 |
| 2026-10-02 12:00 |
23:44:55.80 |
-33:58:42.2 |
HIP 117100 |
29.15 |
| 2026-10-03 00:00 |
23:44:47.02 |
-33:59:05.2 |
HIP 117100 |
28.39 |
| 2026-10-03 12:00 |
23:44:38.26 |
-33:59:27.6 |
HIP 117100 |
27.75 |
| 2026-10-04 00:00 |
23:44:29.51 |
-33:59:49.5 |
HIP 117100 |
27.22 |
| 2026-10-04 12:00 |
23:44:20.79 |
-34:00:10.8 |
HIP 117100 |
26.83 |
| 2026-10-05 00:00 |
23:44:12.08 |
-34:00:31.5 |
HIP 117100 |
26.56 |
| 2026-10-05 12:00 |
23:44:03.40 |
-34:00:51.7 |
HIP 117100 |
26.43 |
| 2026-10-06 00:00 |
23:43:54.74 |
-34:01:11.2 |
HIP 117100 |
26.43 |
| 2026-10-06 12:00 |
23:43:46.10 |
-34:01:30.2 |
HIP 117100 |
26.56 |
| 2026-10-07 00:00 |
23:43:37.49 |
-34:01:48.7 |
HIP 117100 |
26.82 |
| 2026-10-07 12:00 |
23:43:28.90 |
-34:02:06.5 |
HIP 116885 |
26.35 |
| 2026-10-08 00:00 |
23:43:20.33 |
-34:02:23.8 |
HIP 116885 |
24.59 |
| 2026-10-08 12:00 |
23:43:11.79 |
-34:02:40.5 |
HIP 116885 |
22.85 |
| 2026-10-09 00:00 |
23:43:03.28 |
-34:02:56.7 |
HIP 116885 |
21.13 |
| 2026-10-09 12:00 |
23:42:54.79 |
-34:03:12.2 |
HIP 116885 |
19.42 |
| 2026-10-10 00:00 |
23:42:46.33 |
-34:03:27.2 |
HIP 116885 |
17.74 |
| 2026-10-10 12:00 |
23:42:37.90 |
-34:03:41.6 |
HIP 116885 |
16.09 |
| 2026-10-11 00:00 |
23:42:29.50 |
-34:03:55.4 |
HIP 116885 |
14.48 |